Added sahlnaskh arabic font and give it higher precedence than DroidNaskh

sahlnaskh font is a fork of DroidNaskh font with some issues fixed.
Details of fixes are in https://github.com/khaledhosny/sahl-naskh

This should fix Jira issue: http://jira.omnirom.org/browse/OMNI-307

Change-Id: I9251eaf6c22288428f49916aa798be4ff3eaaead
Keyguard: smooth background change.

Change-Id: Ia0e4d0000db72b5cdb6fede03791805e34fa311d

Conflicts:
	packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java