diff --git a/vendor/github.com/googleapis/gnostic/compiler/reader.go b/vendor/github.com/googleapis/gnostic/compiler/reader.go
new file mode 100644
index 0000000..955b985
--- /dev/null
+++ b/vendor/github.com/googleapis/gnostic/compiler/reader.go
@@ -0,0 +1,241 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package compiler
+
+import (
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"net/url"
+	"path/filepath"
+	"strings"
+
+	yaml "gopkg.in/yaml.v2"
+)
+
+var fileCache map[string][]byte
+var infoCache map[string]interface{}
+var count int64
+
+var verboseReader = false
+var fileCacheEnable = true
+var infoCacheEnable = true
+
+func initializeFileCache() {
+	if fileCache == nil {
+		fileCache = make(map[string][]byte, 0)
+	}
+}
+
+func initializeInfoCache() {
+	if infoCache == nil {
+		infoCache = make(map[string]interface{}, 0)
+	}
+}
+
+func EnableFileCache() {
+	fileCacheEnable = true
+}
+
+func EnableInfoCache() {
+	infoCacheEnable = true
+}
+
+func DisableFileCache() {
+	fileCacheEnable = false
+}
+
+func DisableInfoCache() {
+	infoCacheEnable = false
+}
+
+func RemoveFromFileCache(fileurl string) {
+	if !fileCacheEnable {
+		return
+	}
+	initializeFileCache()
+	delete(fileCache, fileurl)
+}
+
+func RemoveFromInfoCache(filename string) {
+	if !infoCacheEnable {
+		return
+	}
+	initializeInfoCache()
+	delete(infoCache, filename)
+}
+
+func GetInfoCache() map[string]interface{} {
+	if infoCache == nil {
+		initializeInfoCache()
+	}
+	return infoCache
+}
+
+func ClearFileCache() {
+	fileCache = make(map[string][]byte, 0)
+}
+
+func ClearInfoCache() {
+	infoCache = make(map[string]interface{})
+}
+
+func ClearCaches() {
+	ClearFileCache()
+	ClearInfoCache()
+}
+
+// FetchFile gets a specified file from the local filesystem or a remote location.
+func FetchFile(fileurl string) ([]byte, error) {
+	var bytes []byte
+	initializeFileCache()
+	if fileCacheEnable {
+		bytes, ok := fileCache[fileurl]
+		if ok {
+			if verboseReader {
+				log.Printf("Cache hit %s", fileurl)
+			}
+			return bytes, nil
+		}
+		if verboseReader {
+			log.Printf("Fetching %s", fileurl)
+		}
+	}
+	response, err := http.Get(fileurl)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+	if response.StatusCode != 200 {
+		return nil, errors.New(fmt.Sprintf("Error downloading %s: %s", fileurl, response.Status))
+	}
+	bytes, err = ioutil.ReadAll(response.Body)
+	if fileCacheEnable && err == nil {
+		fileCache[fileurl] = bytes
+	}
+	return bytes, err
+}
+
+// ReadBytesForFile reads the bytes of a file.
+func ReadBytesForFile(filename string) ([]byte, error) {
+	// is the filename a url?
+	fileurl, _ := url.Parse(filename)
+	if fileurl.Scheme != "" {
+		// yes, fetch it
+		bytes, err := FetchFile(filename)
+		if err != nil {
+			return nil, err
+		}
+		return bytes, nil
+	}
+	// no, it's a local filename
+	bytes, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+	return bytes, nil
+}
+
+// ReadInfoFromBytes unmarshals a file as a yaml.MapSlice.
+func ReadInfoFromBytes(filename string, bytes []byte) (interface{}, error) {
+	initializeInfoCache()
+	if infoCacheEnable {
+		cachedInfo, ok := infoCache[filename]
+		if ok {
+			if verboseReader {
+				log.Printf("Cache hit info for file %s", filename)
+			}
+			return cachedInfo, nil
+		}
+		if verboseReader {
+			log.Printf("Reading info for file %s", filename)
+		}
+	}
+	var info yaml.MapSlice
+	err := yaml.Unmarshal(bytes, &info)
+	if err != nil {
+		return nil, err
+	}
+	if infoCacheEnable && len(filename) > 0 {
+		infoCache[filename] = info
+	}
+	return info, nil
+}
+
+// ReadInfoForRef reads a file and return the fragment needed to resolve a $ref.
+func ReadInfoForRef(basefile string, ref string) (interface{}, error) {
+	initializeInfoCache()
+	if infoCacheEnable {
+		info, ok := infoCache[ref]
+		if ok {
+			if verboseReader {
+				log.Printf("Cache hit for ref %s#%s", basefile, ref)
+			}
+			return info, nil
+		}
+		if verboseReader {
+			log.Printf("Reading info for ref %s#%s", basefile, ref)
+		}
+	}
+	count = count + 1
+	basedir, _ := filepath.Split(basefile)
+	parts := strings.Split(ref, "#")
+	var filename string
+	if parts[0] != "" {
+		filename = parts[0]
+		if _, err := url.ParseRequestURI(parts[0]); err != nil {
+			// It is not an URL, so the file is local
+			filename = basedir + parts[0]
+		}
+	} else {
+		filename = basefile
+	}
+	bytes, err := ReadBytesForFile(filename)
+	if err != nil {
+		return nil, err
+	}
+	info, err := ReadInfoFromBytes(filename, bytes)
+	if err != nil {
+		log.Printf("File error: %v\n", err)
+	} else {
+		if len(parts) > 1 {
+			path := strings.Split(parts[1], "/")
+			for i, key := range path {
+				if i > 0 {
+					m, ok := info.(yaml.MapSlice)
+					if ok {
+						found := false
+						for _, section := range m {
+							if section.Key == key {
+								info = section.Value
+								found = true
+							}
+						}
+						if !found {
+							infoCache[ref] = nil
+							return nil, NewError(nil, fmt.Sprintf("could not resolve %s", ref))
+						}
+					}
+				}
+			}
+		}
+	}
+	if infoCacheEnable {
+		infoCache[ref] = info
+	}
+	return info, nil
+}