diff --git a/vendor/github.com/boljen/go-bitmap/bitmap.go b/vendor/github.com/boljen/go-bitmap/bitmap.go
new file mode 100644
index 0000000..dfe5cc2
--- /dev/null
+++ b/vendor/github.com/boljen/go-bitmap/bitmap.go
@@ -0,0 +1,200 @@
+// Package bitmap implements (thread-safe) bitmap functions and abstractions.
+//
+// Installation
+//
+// 	  go get github.com/boljen/go-bitmap
+package bitmap
+
+import "sync"
+
+var (
+	tA = [8]byte{1, 2, 4, 8, 16, 32, 64, 128}
+	tB = [8]byte{254, 253, 251, 247, 239, 223, 191, 127}
+)
+
+func dataOrCopy(d []byte, c bool) []byte {
+	if !c {
+		return d
+	}
+	ndata := make([]byte, len(d))
+	copy(ndata, d)
+	return ndata
+}
+
+// NewSlice creates a new byteslice with length l (in bits).
+// The actual size in bits might be up to 7 bits larger because
+// they are stored in a byteslice.
+func NewSlice(l int) []byte {
+	remainder := l % 8
+	if remainder != 0 {
+		remainder = 1
+	}
+	return make([]byte, l/8+remainder)
+}
+
+// Get returns the value of bit i from map m.
+// It doesn't check the bounds of the slice.
+func Get(m []byte, i int) bool {
+	return m[i/8]&tA[i%8] != 0
+}
+
+// Set sets bit i of map m to value v.
+// It doesn't check the bounds of the slice.
+func Set(m []byte, i int, v bool) {
+	index := i / 8
+	bit := i % 8
+	if v {
+		m[index] = m[index] | tA[bit]
+	} else {
+		m[index] = m[index] & tB[bit]
+	}
+}
+
+// GetBit returns the value of bit i of byte b.
+// The bit index must be between 0 and 7.
+func GetBit(b byte, i int) bool {
+	return b&tA[i] != 0
+}
+
+// SetBit sets bit i of byte b to value v.
+// The bit index must be between 0 and 7.
+func SetBit(b byte, i int, v bool) byte {
+	if v {
+		return b | tA[i]
+	}
+	return b & tB[i]
+}
+
+// SetBitRef sets bit i of byte *b to value v.
+func SetBitRef(b *byte, i int, v bool) {
+	if v {
+		*b = *b | tA[i]
+	} else {
+		*b = *b & tB[i]
+	}
+}
+
+// Len returns the length (in bits) of the provided byteslice.
+// It will always be a multipile of 8 bits.
+func Len(m []byte) int {
+	return len(m) * 8
+}
+
+// Bitmap is a byteslice with bitmap functions.
+// Creating one form existing data is as simple as bitmap := Bitmap(data).
+type Bitmap []byte
+
+// New creates a new Bitmap instance with length l (in bits).
+func New(l int) Bitmap {
+	return NewSlice(l)
+}
+
+// Len wraps around the Len function.
+func (b Bitmap) Len() int {
+	return Len(b)
+}
+
+// Get wraps around the Get function.
+func (b Bitmap) Get(i int) bool {
+	return Get(b, i)
+}
+
+// Set wraps around the Set function.
+func (b Bitmap) Set(i int, v bool) {
+	Set(b, i, v)
+}
+
+// Data returns the data of the bitmap.
+// If copy is false the actual underlying slice will be returned.
+func (b Bitmap) Data(copy bool) []byte {
+	return dataOrCopy(b, copy)
+}
+
+// Threadsafe implements thread-safe read- and write locking for the bitmap.
+type Threadsafe struct {
+	bm Bitmap
+	mu sync.RWMutex
+}
+
+// TSFromData creates a new Threadsafe using the provided data.
+// If copy is true the actual slice will be used.
+func TSFromData(data []byte, copy bool) *Threadsafe {
+	return &Threadsafe{
+		bm: Bitmap(dataOrCopy(data, copy)),
+	}
+}
+
+// NewTS creates a new Threadsafe instance.
+func NewTS(length int) *Threadsafe {
+	return &Threadsafe{
+		bm: New(length),
+	}
+}
+
+// Data returns the data of the bitmap.
+// If copy is false the actual underlying slice will be returned.
+func (b *Threadsafe) Data(copy bool) []byte {
+	b.mu.RLock()
+	data := dataOrCopy(b.bm, copy)
+	b.mu.RUnlock()
+	return data
+}
+
+// Len wraps around the Len function.
+func (b Threadsafe) Len() int {
+	b.mu.RLock()
+	l := b.bm.Len()
+	b.mu.RUnlock()
+	return l
+}
+
+// Get wraps around the Get function.
+func (b Threadsafe) Get(i int) bool {
+	b.mu.RLock()
+	v := b.bm.Get(i)
+	b.mu.RUnlock()
+	return v
+}
+
+// Set wraps around the Set function.
+func (b Threadsafe) Set(i int, v bool) {
+	b.mu.Lock()
+	b.bm.Set(i, v)
+	b.mu.Unlock()
+}
+
+// Concurrent is a bitmap implementation that achieves thread-safety
+// using atomic operations along with some unsafe.
+// It performs atomic operations on 32bits of data.
+type Concurrent []byte
+
+// NewConcurrent returns a concurrent bitmap.
+// It will create a bitmap
+func NewConcurrent(l int) Concurrent {
+	remainder := l % 8
+	if remainder != 0 {
+		remainder = 1
+	}
+	return make([]byte, l/8+remainder, l/8+remainder+3)
+}
+
+// Get wraps around the Get function.
+func (c Concurrent) Get(b int) bool {
+	return Get(c, b)
+}
+
+// Set wraps around the SetAtomic function.
+func (c Concurrent) Set(b int, v bool) {
+	SetAtomic(c, b, v)
+}
+
+// Len wraps around the Len function.
+func (c Concurrent) Len() int {
+	return Len(c)
+}
+
+// Data returns the data of the bitmap.
+// If copy is false the actual underlying slice will be returned.
+func (c Concurrent) Data(copy bool) []byte {
+	return dataOrCopy(c, copy)
+}