add license header to files in /lib/

lib/azure.rb

@@ -1,3 +1,17 @@
+#-------------------------------------------------------------------------
+# Copyright 2012 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.
+#--------------------------------------------------------------------------
 require "azure/tables"
 require "azure/blobs"
 require "azure/queues"