Fix #202

Don't reload records if connection is lost.
Handle authentication errors after password change

WriteDetailTask and NetworkTask now have a callback if there is an
authentication error (HTTP status 401). These callbacks are handled in
Home and DetailView.
Now if the user changed his password and does something within the app
that requires authentication a dialog is shown asking for the new
password.
Center textview horizontal (FirstRunActivity)
Fix orientation (FirstRunActivity)
Changes for latest switch to AccountManager
Use AuthenticationCheckTask in FirstTimeInit

This removes the networkThread and the messenger-Handler.
Automatic code reformat as suggested by @ratan12
Merge pull request #203 from d-sko/startup_crash_fix

Correct record reloading.

Fixes #202
Merge pull request #204 from ratan12/Fix_Firsttime

Center textview & fix orientation (FirstRunActivity)
Merge pull request #205 from d-sko/auth_fix

Handle password changes
Bump Version

Bump the version number so that any crash reports properly show as a
pre-release build.