Fixed contstant warnings in Logcat of menu image not found
Fixed Android.R errors (wrong namespace in manifest)
Syncservice now gets triggered automatically (and is hand-triggerable) by app, other changes (see below)

- Syncservice now gets triggered automatically (and is hand-triggerable)
by app.
- Syncservice gets scheduled when app is authenticated (not when it's
started)
- Android is now properly aware of sync service and sees accounts.
- Proper implementation of auth token request
- Moved and partially implemented netcommunication to
ServerAccessor.java
- Logged in accounts will show up in Android settings menu (please do
not try to add a new one)
Fixed some issues with how the accounts show up in settings menu