Add vendor folder to git

vendor/github.com/googleapis/gnostic/printer/README.md

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+# printer
+
+This directory contains code for generating files of code.

vendor/github.com/googleapis/gnostic/printer/code.go

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+// 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 printer provides support for writing generated code.
+package printer
+
+import (
+	"fmt"
+)
+
+const INDENT = "  "
+
+type Code struct {
+	text   string
+	indent int
+}
+
+func (c *Code) Print(args ...interface{}) {
+	if len(args) > 0 {
+		for i := 0; i < c.indent; i++ {
+			c.text += INDENT
+		}
+		c.text += fmt.Sprintf(args[0].(string), args[1:]...)
+	}
+	c.text += "\n"
+}
+
+func (c *Code) String() string {
+	return c.text
+}
+
+func (c *Code) Indent() {
+	c.indent += 1
+}
+
+func (c *Code) Outdent() {
+	c.indent -= 1
+	if c.indent < 0 {
+		c.indent = 0
+	}
+}