Adds widget launching functionality on Android

Widgets can be launched using the AppLaucher API by specifying the ID
of the installed widget.

Removes issue with quotes on AppLauncher's testbed page.

Jira issue: WP-874
Cleans up code. Removes untidy whitespace.

Jira issue: WP-874
Android: Add PZP event register and unregister interface

Jira Issue: WP-822
Merge pull request #534 from ziransun/pzp-event-register

Android: Add PZP event register and unregister interface
Merge pull request #533 from mlasak/WP-874

Adds widget launching functionality on Android
Renamed this.listeners attribute in this.sensorEventListeners

Jira issue: WP-904
Merge pull request #535 from glatorre/WP-904

Fixed a bug described in WP-904 affecting SensorService