[DEV-1394] Replace username with get_full_name() as appropriate throughout templates.
[DEV-1394] Undo previous change of username in javascript.
[DEV-1394] Add get_full_name method to AskbotUser so that only last initial is displayed.
[DEV-1394] Add fake firstname-lastname for user creation in tests.
[askrover] Merge branch 'DEV-1394' into askrover

Conflicts:
	askbot/models/askbot_user.py