Mobile code

Added sample code for the describe UpVoteDownVote App, this should be a good basis for the developer day app wise, as it is as easy as possible but contains most of the stuff needed to understand Couchbase Lite Development on Android 

- Views
- Live Query
- Saving Document
- Retrieving Documents
- Replication

@WilliamHoang @matthewrevell please review when you have time.

The next step is to extract out a StarterKit for the Developer Day participants to clone and get started with.