add GDrive provider support (#118)

* GDrive provider support
* More reliable basedir ownership
* Fix mimetype

vendor/google.golang.org/api/transport/dial.go

@@ -0,0 +1,49 @@
+// Copyright 2015 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 transport supports network connections to HTTP and GRPC servers.
+// This package is not intended for use by end developers. Use the
+// google.golang.org/api/option package to configure API clients.
+package transport
+
+import (
+	"net/http"
+
+	"golang.org/x/net/context"
+	"google.golang.org/grpc"
+
+	"google.golang.org/api/option"
+	gtransport "google.golang.org/api/transport/grpc"
+	htransport "google.golang.org/api/transport/http"
+)
+
+// NewHTTPClient returns an HTTP client for use communicating with a Google cloud
+// service, configured with the given ClientOptions. It also returns the endpoint
+// for the service as specified in the options.
+func NewHTTPClient(ctx context.Context, opts ...option.ClientOption) (*http.Client, string, error) {
+	return htransport.NewClient(ctx, opts...)
+}
+
+// DialGRPC returns a GRPC connection for use communicating with a Google cloud
+// service, configured with the given ClientOptions.
+func DialGRPC(ctx context.Context, opts ...option.ClientOption) (*grpc.ClientConn, error) {
+	return gtransport.Dial(ctx, opts...)
+}
+
+// DialGRPCInsecure returns an insecure GRPC connection for use communicating
+// with fake or mock Google cloud service implementations, such as emulators.
+// The connection is configured with the given ClientOptions.
+func DialGRPCInsecure(ctx context.Context, opts ...option.ClientOption) (*grpc.ClientConn, error) {
+	return gtransport.DialInsecure(ctx, opts...)
+}