Added installation of Maven Android SDK Deployer to rake init

- The installation of Maven Android SDK Deployer ensures that all
  Android SDK libs are available through Maven. This will prevent errors
  in locating these libraries and jars during compilation if they are
  imported via code. This is taken care of by rake init.
- Updated path constants to reduce redundancy.

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