Build instructions added

(no more hardcode, caused crashes with different application id)

Conflicts:
	app/src/main/res/xml/preference_editor.xml

Set textColor value to textColorPrimary attribute to facilitate theme'ing

Navigation drawer for main activity. "Settings", "about" and "exit" moved to drawer from options menu. New icons.

ActionBarPainter renamed to BarPainter.
AppCompatActivity used instead of ActionBarActivity.

ChatMessageAdapter: simplified, unified base service message view holder used for all types of messages.