Added music alarm feature

Added ability to playback a music file instead of an alarm.
I added a Song Picker activity and made some changes to the
alarm clock layout, to switch between alarm and music you
need to click the icon next to the ringtone name textview.

The Song Picker activity returns the file's URI so it works
the same way as normal ringtone, no changes have been made
to the process of setting an alarm and the klaxon.

Did some cleanup in my files, mainly whitespaces errors,
silly eclipse made some useless line breaks...

Change-Id: Idf4b17c9bd55a761a9e6c0a1ed149121a11e49ca

Conflicts:
	res/layout/alarm_time.xml