Check in the vendor directory

Travis seems to be having issues pulling deps, so we'll have to check in
the vendor directory and prevent the makefile from trying to regenerate
it normally.

vendor/github.com/googleapis/gnostic/compiler/error.go

@@ -0,0 +1,61 @@
+// 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
+
+// Error represents compiler errors and their location in the document.
+type Error struct {
+	Context *Context
+	Message string
+}
+
+// NewError creates an Error.
+func NewError(context *Context, message string) *Error {
+	return &Error{Context: context, Message: message}
+}
+
+// Error returns the string value of an Error.
+func (err *Error) Error() string {
+	if err.Context == nil {
+		return "ERROR " + err.Message
+	}
+	return "ERROR " + err.Context.Description() + " " + err.Message
+}
+
+// ErrorGroup is a container for groups of Error values.
+type ErrorGroup struct {
+	Errors []error
+}
+
+// NewErrorGroupOrNil returns a new ErrorGroup for a slice of errors or nil if the slice is empty.
+func NewErrorGroupOrNil(errors []error) error {
+	if len(errors) == 0 {
+		return nil
+	} else if len(errors) == 1 {
+		return errors[0]
+	} else {
+		return &ErrorGroup{Errors: errors}
+	}
+}
+
+func (group *ErrorGroup) Error() string {
+	result := ""
+	for i, err := range group.Errors {
+		if i > 0 {
+			result += "\n"
+		}
+		result += err.Error()
+	}
+	return result
+}