If android is not in the path or if the permissions are not correct, then ruboto gen app just stops with no information. Need to say what happened or test for permission and report problems.
Looks like we should add a test to check the version of the Android SDK (>= 14) too.
I have added a check for valid android command on the path.
I have not found any way to determine the current Android SDK tools version.
* Issue #129 Make ruboto gen app fail with more information
* Added check for the "android" command before launching the "ruboto" command.
* Fixed stupid Java errors.