[Add] GoogleProtobuf 2.6.1

https://developers.google.com/protocol-buffers/docs/downloads    
Github Repository

Protocol Buffers source code is hosted on github: https://github.com/google/protobuf.

Google Code Repostiory

Our old Google Code repositiory is: https://code.google.com/p/protobuf/. We moved to github on Aug 26, 2014 and no future changes will be made on the Google Code site. For latest code updates/issues, please visit our github site.

The protobuf version on pod is too old !