Added initial onClickListener to imageView in messages
Switch to AppCompat, improve API 9 UI

Fixed #45, fixed #28
Show users online in user list
Refactor MessagesActivity, improved API 9 support, disable SettingsActivity for API 9
Page: Make mDateFormat static to improve speed (issue #41)
BackoffUtils: To manage refresh backoff code
ClearableEditText: Use button selector instead of one drawable
Use Holo send button on all versions
Improve login.xml layout on API 9, make EditTexts single line