Feature/deep linking 269

This adds "deep-linking" ( issue #269 ) which enables external apps to use the wordpress:// protocol to display a specific post in the native Reader.

I've uploaded a simple tester app here:

http://cl.ly/3k2G200a3d12

This tester creates the wordpress://viewpost?blogId={blogId}&postId={postId} link from the typed IDs and launches the intent.