Add vendor folder to git

vendor/github.com/googleapis/gnostic/generator/helpers.go

@@ -0,0 +1,34 @@
+// 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 main
+
+// Returns a "snake case" form of a camel-cased string.
+func camelCaseToSnakeCase(input string) string {
+	var out = ""
+
+	for index, runeValue := range input {
+		//fmt.Printf("%#U starts at byte position %d\n", runeValue, index)
+		if runeValue >= 'A' && runeValue <= 'Z' {
+			if index > 0 {
+				out += "_"
+			}
+			out += string(runeValue - 'A' + 'a')
+		} else {
+			out += string(runeValue)
+		}
+
+	}
+	return out
+}