Favorites migration (resolved)

**Third time lucky?!**

Replaces messy PR from before...

Fixes #74 

#### IMPORTANT

It also version bumps, and MORE IMPORTANTLY.. it changes the package from `com.spideroak.android.beta` to `com.spideroak.android` in preparation for proper release.

**Once this PR has been merged, installing this app will overwrite the native app if it's there.**

**This means that you can no longer have them side by side, and that you cannot install a debug version of this one without first uninstalling the old native app.**

The next thing will be to change the actual `AndroidManifest.xml` to have a higher versionCode and versionName than the current native app.

    <manifest android:hardwareAccelerated="true" android:versionCode="20" 
      android:versionName="2.0.0" android:windowSoftInputMode="adjustPan" 
      package="com.spideroak.android" 
      xmlns:android="http://schemas.android.com/apk/res/android">