Added Splash Screen

- Splash Screen displays for 5 seconds and then launches the main Note
  Activity
- A blank Note Activity has been added as well
- Drawables currently display nothing

Signed-off-by: Byron Sanchez <bfs5030@gmail.com>
Updated build and test scripts to properly build and deploy app

- Previously, the build did not create the apk file. Now, "rake build"
  will create the apk by going through the entire maven build lifecycle
  (including running tests).

- Invoking "rake build-tests" now runs a clean and will recompile tests
  every time it is invoked.

Signed-off-by: Byron Sanchez <bfs5030@gmail.com>