diff --git a/vendor/github.com/googleapis/gnostic/extensions/COMPILE-EXTENSION.sh b/vendor/github.com/googleapis/gnostic/extensions/COMPILE-EXTENSION.sh
new file mode 100755
index 0000000..68d02a0
--- /dev/null
+++ b/vendor/github.com/googleapis/gnostic/extensions/COMPILE-EXTENSION.sh
@@ -0,0 +1,5 @@
+go get github.com/golang/protobuf/protoc-gen-go
+
+protoc \
+--go_out=Mgoogle/protobuf/any.proto=github.com/golang/protobuf/ptypes/any:. *.proto 
+
diff --git a/vendor/github.com/googleapis/gnostic/extensions/README.md b/vendor/github.com/googleapis/gnostic/extensions/README.md
new file mode 100644
index 0000000..ff1c2eb
--- /dev/null
+++ b/vendor/github.com/googleapis/gnostic/extensions/README.md
@@ -0,0 +1,5 @@
+# Extensions
+
+This directory contains support code for building Gnostic extensions and associated examples.
+
+Extensions are used to compile vendor or specification extensions into protocol buffer structures.
diff --git a/vendor/github.com/googleapis/gnostic/extensions/extension.proto b/vendor/github.com/googleapis/gnostic/extensions/extension.proto
new file mode 100644
index 0000000..04856f9
--- /dev/null
+++ b/vendor/github.com/googleapis/gnostic/extensions/extension.proto
@@ -0,0 +1,93 @@
+// 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.
+
+syntax = "proto3";
+
+import "google/protobuf/any.proto";
+package openapiextension.v1;
+
+// This option lets the proto compiler generate Java code inside the package
+// name (see below) instead of inside an outer class. It creates a simpler
+// developer experience by reducing one-level of name nesting and be
+// consistent with most programming languages that don't support outer classes.
+option java_multiple_files = true;
+
+// The Java outer classname should be the filename in UpperCamelCase. This
+// class is only used to hold proto descriptor, so developers don't need to
+// work with it directly.
+option java_outer_classname = "OpenAPIExtensionV1";
+
+// The Java package name must be proto package name with proper prefix.
+option java_package = "org.gnostic.v1";
+
+// A reasonable prefix for the Objective-C symbols generated from the package.
+// It should at a minimum be 3 characters long, all uppercase, and convention
+// is to use an abbreviation of the package name. Something short, but
+// hopefully unique enough to not conflict with things that may come along in
+// the future. 'GPB' is reserved for the protocol buffer implementation itself.
+//
+option objc_class_prefix = "OAE"; // "OpenAPI Extension"
+
+// The version number of OpenAPI compiler.
+message Version {
+  int32 major = 1;
+  int32 minor = 2;
+  int32 patch = 3;
+  // A suffix for alpha, beta or rc release, e.g., "alpha-1", "rc2". It should
+  // be empty for mainline stable releases.
+  string suffix = 4;
+}
+
+// An encoded Request is written to the ExtensionHandler's stdin.
+message ExtensionHandlerRequest {
+
+  // The OpenAPI descriptions that were explicitly listed on the command line.
+  // The specifications will appear in the order they are specified to gnostic.
+  Wrapper wrapper = 1;
+
+  // The version number of openapi compiler.
+  Version compiler_version = 3;
+}
+
+// The extensions writes an encoded ExtensionHandlerResponse to stdout.
+message ExtensionHandlerResponse {
+
+  // true if the extension is handled by the extension handler; false otherwise
+  bool handled = 1;
+
+  // Error message.  If non-empty, the extension handling failed.
+  // The extension handler process should exit with status code zero
+  // even if it reports an error in this way.
+  //
+  // This should be used to indicate errors which prevent the extension from
+  // operating as intended.  Errors which indicate a problem in gnostic
+  // itself -- such as the input Document being unparseable -- should be
+  // reported by writing a message to stderr and exiting with a non-zero
+  // status code.
+  repeated string error = 2;
+
+  // text output
+  google.protobuf.Any value = 3;
+}
+
+message Wrapper {
+  // version of the OpenAPI specification in which this extension was written.
+  string version = 1;
+
+  // Name of the extension
+  string extension_name = 2;
+
+  // Must be a valid yaml for the proto
+  string yaml = 3;
+}
diff --git a/vendor/github.com/googleapis/gnostic/extensions/extensions.go b/vendor/github.com/googleapis/gnostic/extensions/extensions.go
new file mode 100644
index 0000000..94a8e62
--- /dev/null
+++ b/vendor/github.com/googleapis/gnostic/extensions/extensions.go
@@ -0,0 +1,82 @@
+// 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 openapiextension_v1
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/golang/protobuf/ptypes"
+)
+
+type documentHandler func(version string, extensionName string, document string)
+type extensionHandler func(name string, yamlInput string) (bool, proto.Message, error)
+
+func forInputYamlFromOpenapic(handler documentHandler) {
+	data, err := ioutil.ReadAll(os.Stdin)
+	if err != nil {
+		fmt.Println("File error:", err.Error())
+		os.Exit(1)
+	}
+	if len(data) == 0 {
+		fmt.Println("No input data.")
+		os.Exit(1)
+	}
+	request := &ExtensionHandlerRequest{}
+	err = proto.Unmarshal(data, request)
+	if err != nil {
+		fmt.Println("Input error:", err.Error())
+		os.Exit(1)
+	}
+	handler(request.Wrapper.Version, request.Wrapper.ExtensionName, request.Wrapper.Yaml)
+}
+
+// ProcessExtension calles the handler for a specified extension.
+func ProcessExtension(handleExtension extensionHandler) {
+	response := &ExtensionHandlerResponse{}
+	forInputYamlFromOpenapic(
+		func(version string, extensionName string, yamlInput string) {
+			var newObject proto.Message
+			var err error
+
+			handled, newObject, err := handleExtension(extensionName, yamlInput)
+			if !handled {
+				responseBytes, _ := proto.Marshal(response)
+				os.Stdout.Write(responseBytes)
+				os.Exit(0)
+			}
+
+			// If we reach here, then the extension is handled
+			response.Handled = true
+			if err != nil {
+				response.Error = append(response.Error, err.Error())
+				responseBytes, _ := proto.Marshal(response)
+				os.Stdout.Write(responseBytes)
+				os.Exit(0)
+			}
+			response.Value, err = ptypes.MarshalAny(newObject)
+			if err != nil {
+				response.Error = append(response.Error, err.Error())
+				responseBytes, _ := proto.Marshal(response)
+				os.Stdout.Write(responseBytes)
+				os.Exit(0)
+			}
+		})
+
+	responseBytes, _ := proto.Marshal(response)
+	os.Stdout.Write(responseBytes)
+}