fix some bugs. When you receive a new chat, a notification appears. Need some improvements cause if the chat was created before, then close no notification appears (nofif only on new created chat).

<?xml version="1.0" encoding="utf-8"?>
<resources>
	<color name="blue_sky">#A0C8FF</color>
	<color name="black">#000000</color>
<color name="white">#FFFFFF</color>
</resources>