Update vendored dependencies

This includes github.com/kurin/blazer 0.2.0, which resolves #1291

vendor/github.com/Azure/azure-sdk-for-go/storage/commonsasuri.go

@@ -0,0 +1,38 @@
+package storage
+
+// Copyright 2017 Microsoft Corporation
+//
+//  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.
+
+import (
+	"net/url"
+	"time"
+)
+
+// SASOptions includes options used by SAS URIs for different
+// services and resources.
+type SASOptions struct {
+	APIVersion string
+	Start      time.Time
+	Expiry     time.Time
+	IP         string
+	UseHTTPS   bool
+	Identifier string
+}
+
+func addQueryParameter(query url.Values, key, value string) url.Values {
+	if value != "" {
+		query.Add(key, value)
+	}
+	return query
+}