diff --git a/vendor/github.com/jessevdk/go-flags/command.go b/vendor/github.com/jessevdk/go-flags/command.go
new file mode 100644
index 0000000..486bacb
--- /dev/null
+++ b/vendor/github.com/jessevdk/go-flags/command.go
@@ -0,0 +1,465 @@
+package flags
+
+import (
+	"reflect"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+// Command represents an application command. Commands can be added to the
+// parser (which itself is a command) and are selected/executed when its name
+// is specified on the command line. The Command type embeds a Group and
+// therefore also carries a set of command specific options.
+type Command struct {
+	// Embedded, see Group for more information
+	*Group
+
+	// The name by which the command can be invoked
+	Name string
+
+	// The active sub command (set by parsing) or nil
+	Active *Command
+
+	// Whether subcommands are optional
+	SubcommandsOptional bool
+
+	// Aliases for the command
+	Aliases []string
+
+	// Whether positional arguments are required
+	ArgsRequired bool
+
+	commands            []*Command
+	hasBuiltinHelpGroup bool
+	args                []*Arg
+}
+
+// Commander is an interface which can be implemented by any command added in
+// the options. When implemented, the Execute method will be called for the last
+// specified (sub)command providing the remaining command line arguments.
+type Commander interface {
+	// Execute will be called for the last active (sub)command. The
+	// args argument contains the remaining command line arguments. The
+	// error that Execute returns will be eventually passed out of the
+	// Parse method of the Parser.
+	Execute(args []string) error
+}
+
+// Usage is an interface which can be implemented to show a custom usage string
+// in the help message shown for a command.
+type Usage interface {
+	// Usage is called for commands to allow customized printing of command
+	// usage in the generated help message.
+	Usage() string
+}
+
+type lookup struct {
+	shortNames map[string]*Option
+	longNames  map[string]*Option
+
+	commands map[string]*Command
+}
+
+// AddCommand adds a new command to the parser with the given name and data. The
+// data needs to be a pointer to a struct from which the fields indicate which
+// options are in the command. The provided data can implement the Command and
+// Usage interfaces.
+func (c *Command) AddCommand(command string, shortDescription string, longDescription string, data interface{}) (*Command, error) {
+	cmd := newCommand(command, shortDescription, longDescription, data)
+
+	cmd.parent = c
+
+	if err := cmd.scan(); err != nil {
+		return nil, err
+	}
+
+	c.commands = append(c.commands, cmd)
+	return cmd, nil
+}
+
+// AddGroup adds a new group to the command with the given name and data. The
+// data needs to be a pointer to a struct from which the fields indicate which
+// options are in the group.
+func (c *Command) AddGroup(shortDescription string, longDescription string, data interface{}) (*Group, error) {
+	group := newGroup(shortDescription, longDescription, data)
+
+	group.parent = c
+
+	if err := group.scanType(c.scanSubcommandHandler(group)); err != nil {
+		return nil, err
+	}
+
+	c.groups = append(c.groups, group)
+	return group, nil
+}
+
+// Commands returns a list of subcommands of this command.
+func (c *Command) Commands() []*Command {
+	return c.commands
+}
+
+// Find locates the subcommand with the given name and returns it. If no such
+// command can be found Find will return nil.
+func (c *Command) Find(name string) *Command {
+	for _, cc := range c.commands {
+		if cc.match(name) {
+			return cc
+		}
+	}
+
+	return nil
+}
+
+// FindOptionByLongName finds an option that is part of the command, or any of
+// its parent commands, by matching its long name (including the option
+// namespace).
+func (c *Command) FindOptionByLongName(longName string) (option *Option) {
+	for option == nil && c != nil {
+		option = c.Group.FindOptionByLongName(longName)
+
+		c, _ = c.parent.(*Command)
+	}
+
+	return option
+}
+
+// FindOptionByShortName finds an option that is part of the command, or any of
+// its parent commands, by matching its long name (including the option
+// namespace).
+func (c *Command) FindOptionByShortName(shortName rune) (option *Option) {
+	for option == nil && c != nil {
+		option = c.Group.FindOptionByShortName(shortName)
+
+		c, _ = c.parent.(*Command)
+	}
+
+	return option
+}
+
+// Args returns a list of positional arguments associated with this command.
+func (c *Command) Args() []*Arg {
+	ret := make([]*Arg, len(c.args))
+	copy(ret, c.args)
+
+	return ret
+}
+
+func newCommand(name string, shortDescription string, longDescription string, data interface{}) *Command {
+	return &Command{
+		Group: newGroup(shortDescription, longDescription, data),
+		Name:  name,
+	}
+}
+
+func (c *Command) scanSubcommandHandler(parentg *Group) scanHandler {
+	f := func(realval reflect.Value, sfield *reflect.StructField) (bool, error) {
+		mtag := newMultiTag(string(sfield.Tag))
+
+		if err := mtag.Parse(); err != nil {
+			return true, err
+		}
+
+		positional := mtag.Get("positional-args")
+
+		if len(positional) != 0 {
+			stype := realval.Type()
+
+			for i := 0; i < stype.NumField(); i++ {
+				field := stype.Field(i)
+
+				m := newMultiTag((string(field.Tag)))
+
+				if err := m.Parse(); err != nil {
+					return true, err
+				}
+
+				name := m.Get("positional-arg-name")
+
+				if len(name) == 0 {
+					name = field.Name
+				}
+
+				required := -1
+				requiredMaximum := -1
+
+				sreq := m.Get("required")
+
+				if sreq != "" {
+					required = 1
+
+					rng := strings.SplitN(sreq, "-", 2)
+
+					if len(rng) > 1 {
+						if preq, err := strconv.ParseInt(rng[0], 10, 32); err == nil {
+							required = int(preq)
+						}
+
+						if preq, err := strconv.ParseInt(rng[1], 10, 32); err == nil {
+							requiredMaximum = int(preq)
+						}
+					} else {
+						if preq, err := strconv.ParseInt(sreq, 10, 32); err == nil {
+							required = int(preq)
+						}
+					}
+				}
+
+				arg := &Arg{
+					Name:            name,
+					Description:     m.Get("description"),
+					Required:        required,
+					RequiredMaximum: requiredMaximum,
+
+					value: realval.Field(i),
+					tag:   m,
+				}
+
+				c.args = append(c.args, arg)
+
+				if len(mtag.Get("required")) != 0 {
+					c.ArgsRequired = true
+				}
+			}
+
+			return true, nil
+		}
+
+		subcommand := mtag.Get("command")
+
+		if len(subcommand) != 0 {
+			var ptrval reflect.Value
+
+			if realval.Kind() == reflect.Ptr {
+				ptrval = realval
+
+				if ptrval.IsNil() {
+					ptrval.Set(reflect.New(ptrval.Type().Elem()))
+				}
+			} else {
+				ptrval = realval.Addr()
+			}
+
+			shortDescription := mtag.Get("description")
+			longDescription := mtag.Get("long-description")
+			subcommandsOptional := mtag.Get("subcommands-optional")
+			aliases := mtag.GetMany("alias")
+
+			subc, err := c.AddCommand(subcommand, shortDescription, longDescription, ptrval.Interface())
+
+			if err != nil {
+				return true, err
+			}
+
+			subc.Hidden = mtag.Get("hidden") != ""
+
+			if len(subcommandsOptional) > 0 {
+				subc.SubcommandsOptional = true
+			}
+
+			if len(aliases) > 0 {
+				subc.Aliases = aliases
+			}
+
+			return true, nil
+		}
+
+		return parentg.scanSubGroupHandler(realval, sfield)
+	}
+
+	return f
+}
+
+func (c *Command) scan() error {
+	return c.scanType(c.scanSubcommandHandler(c.Group))
+}
+
+func (c *Command) eachOption(f func(*Command, *Group, *Option)) {
+	c.eachCommand(func(c *Command) {
+		c.eachGroup(func(g *Group) {
+			for _, option := range g.options {
+				f(c, g, option)
+			}
+		})
+	}, true)
+}
+
+func (c *Command) eachCommand(f func(*Command), recurse bool) {
+	f(c)
+
+	for _, cc := range c.commands {
+		if recurse {
+			cc.eachCommand(f, true)
+		} else {
+			f(cc)
+		}
+	}
+}
+
+func (c *Command) eachActiveGroup(f func(cc *Command, g *Group)) {
+	c.eachGroup(func(g *Group) {
+		f(c, g)
+	})
+
+	if c.Active != nil {
+		c.Active.eachActiveGroup(f)
+	}
+}
+
+func (c *Command) addHelpGroups(showHelp func() error) {
+	if !c.hasBuiltinHelpGroup {
+		c.addHelpGroup(showHelp)
+		c.hasBuiltinHelpGroup = true
+	}
+
+	for _, cc := range c.commands {
+		cc.addHelpGroups(showHelp)
+	}
+}
+
+func (c *Command) makeLookup() lookup {
+	ret := lookup{
+		shortNames: make(map[string]*Option),
+		longNames:  make(map[string]*Option),
+		commands:   make(map[string]*Command),
+	}
+
+	parent := c.parent
+
+	var parents []*Command
+
+	for parent != nil {
+		if cmd, ok := parent.(*Command); ok {
+			parents = append(parents, cmd)
+			parent = cmd.parent
+		} else {
+			parent = nil
+		}
+	}
+
+	for i := len(parents) - 1; i >= 0; i-- {
+		parents[i].fillLookup(&ret, true)
+	}
+
+	c.fillLookup(&ret, false)
+	return ret
+}
+
+func (c *Command) fillLookup(ret *lookup, onlyOptions bool) {
+	c.eachGroup(func(g *Group) {
+		for _, option := range g.options {
+			if option.ShortName != 0 {
+				ret.shortNames[string(option.ShortName)] = option
+			}
+
+			if len(option.LongName) > 0 {
+				ret.longNames[option.LongNameWithNamespace()] = option
+			}
+		}
+	})
+
+	if onlyOptions {
+		return
+	}
+
+	for _, subcommand := range c.commands {
+		ret.commands[subcommand.Name] = subcommand
+
+		for _, a := range subcommand.Aliases {
+			ret.commands[a] = subcommand
+		}
+	}
+}
+
+func (c *Command) groupByName(name string) *Group {
+	if grp := c.Group.groupByName(name); grp != nil {
+		return grp
+	}
+
+	for _, subc := range c.commands {
+		prefix := subc.Name + "."
+
+		if strings.HasPrefix(name, prefix) {
+			if grp := subc.groupByName(name[len(prefix):]); grp != nil {
+				return grp
+			}
+		} else if name == subc.Name {
+			return subc.Group
+		}
+	}
+
+	return nil
+}
+
+type commandList []*Command
+
+func (c commandList) Less(i, j int) bool {
+	return c[i].Name < c[j].Name
+}
+
+func (c commandList) Len() int {
+	return len(c)
+}
+
+func (c commandList) Swap(i, j int) {
+	c[i], c[j] = c[j], c[i]
+}
+
+func (c *Command) sortedVisibleCommands() []*Command {
+	ret := commandList(c.visibleCommands())
+	sort.Sort(ret)
+
+	return []*Command(ret)
+}
+
+func (c *Command) visibleCommands() []*Command {
+	ret := make([]*Command, 0, len(c.commands))
+
+	for _, cmd := range c.commands {
+		if !cmd.Hidden {
+			ret = append(ret, cmd)
+		}
+	}
+
+	return ret
+}
+
+func (c *Command) match(name string) bool {
+	if c.Name == name {
+		return true
+	}
+
+	for _, v := range c.Aliases {
+		if v == name {
+			return true
+		}
+	}
+
+	return false
+}
+
+func (c *Command) hasCliOptions() bool {
+	ret := false
+
+	c.eachGroup(func(g *Group) {
+		if g.isBuiltinHelp {
+			return
+		}
+
+		for _, opt := range g.options {
+			if opt.canCli() {
+				ret = true
+			}
+		}
+	})
+
+	return ret
+}
+
+func (c *Command) fillParseState(s *parseState) {
+	s.positional = make([]*Arg, len(c.args))
+	copy(s.positional, c.args)
+
+	s.lookup = c.makeLookup()
+	s.command = c
+}