Formatting fix
Update compileSdkVersion and targetSdkVersion to 21
Set ic_launcher as launcher icon
Add rudimentary Settings Activity for setting Last.FM username
Rudimentary switch to Dagger
Don't run Proguard on release flavors
Update .gitignore
Move models into their own package
Break out logic of grabbing artwork into it's own injectable class.
MuzeiFmArtSource is far less complicated.