Extracts ContactListModel from ContactListAdapter. Adds tab stubs to the action bar.
Will now select the contact we are chatting with, when chat is opened from the notification. Fixes warning and removes unused code.
Close chat option used on pressed contact will close chat with this contact. Minor fixes.
Merge branch 'call_history'

Conflicts:
	src/org/jitsi/android/gui/contactlist/ContactListAdapter.java
	src/org/jitsi/android/gui/contactlist/ContactListFragment.java
Extracts ContactListModel from ContactListAdapter and ensures that all contact list operations are executed from UI thread.