Mavenize

Uses Maven to build the project.

 * `mvn clean` to clean
 * `mvn package` to build the APK
 * `mvn android:deploy` to deploy to the phone (possibly `mvn android:deploy -Dandroid.undeployBeforeDeploy` to first uninstall the already installed APK)

This requires re-importing the project Eclipse, but once done Eclipse auto-configures itself.