Open Camera now uses Android Studio

Just in case anyone is using the Open Camera source for other projects - I've now made the switch to using Android Studio (Eclipse no longer works properly with Android 7 devices - logging and tests don't work - but it's a good thing to make the transition anyway, now that Eclipse is no longer supported by Google for Android development).

The Git tags pre_Android_Studio and post_Android_Studio mark the transition. I've also integrated the test project into the same repository now, rather than being separate.