Ability to run a release for android

[optikalefx]

Releasing works fine, but there is no way to run that release build on the phone. I'm forced to

1. delete the debug app from the phone
2. run grunt phonegap:release
3. copy that over using android file transfer
4. use APKInstaller on the phone to install that APK.

This is really a painpoint when you're testing in-app-billing or other features that won't work on non-release builds.