Fix problem with action bar and with orientation's change.
Make email and GitHub's url clickable in "About".
Rename to "Berlin event curator". Add crappy text in the main activity
explaining what the app is about.
Change the behaviour from ActionBar from "to home" to "to up".
Change "extra info" to "events info".
Add an event to Google Calendar.
Change minSdkVersion to 14.
Disable the expansion/collapse of groups without events. Add the number
of events for a group in the header.