Simplified version working with an improved version of SpdyOrHttpChooser
Adapting code to new API
Added SpdyClient and associated test

Still lacking some features not provided by Netty, e.g. client version
of the  SpdyStreamIdHandler.
Test now successfully sends a GET. Still need to workout running on maven.
Merge pull request #1 from leogomes/SpdyClient

Initial implementation of SpdyClient.