Implemented preferences change listener.
Removed some unused strings.
Removed lots of hardcoded strings.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	SMSWakeUp/src/main/java/com/snot/smswakeup/MainActivity.java
	SMSWakeUp/src/main/java/com/snot/smswakeup/SmsReceiver.java
	SMSWakeUp/src/main/res/values/strings.xml