Migrator for faves

This will need for anonymous favourites to be fixed first as favorites in the old native app are not per-user.
Getting a lot closer
Fixes #74 !!!

It also version bumps, and MORE IMPORTANTLY.. it changes the package from com.spideroak.android.beta to com.spideroak.android in preparation for proper relaease.
Version bumbumbump
Merge pull request #220 from SpiderOak/favorites-migration-resolved1

Favorites migration (resolved)
Fixes #220
Mighty Fine!!!