ADD: Initial pushing songs to Firebase.
Basic song receiving works.
Merge branch 'firebase' of https://github.com/hdavidzhu/MobileProtoMusicSprint into firebase

Conflicts:
	app/src/main/java/com/hdavidzhu/mobileprotomusicsprint/MusicService.java
	app/src/main/java/com/hdavidzhu/mobileprotomusicsprint/MyActivity.java
	app/src/main/java/com/hdavidzhu/mobileprotomusicsprint/SnapFirebase.java