Prep release
Invalidate token
Tested on 4.2
Added in-app donations via IAB v3

 * Removed flattr+paypal

in-app donation WIP

bump version

Error out if service cannot be bound

Remove paypal + flattr, add in-app donation support

About, NOTICE

Remove flattr button

Better error handling

Use holo theme for donation dialog

Update readme

Error handling, fix public key

Less state in activity
Fix null user email