made drag area bigger for scrubbing audio
added styling for playing tracks and recent tracks
added ID to playlist views to connect models to views
fade "add to playlist" to show it's already been added
wire up previousSong functionality to button
foundation for retrieving currently playing songs and next and previous views
make song only play when album art is clicked
remove unneeded console logs
highlight first song as currently playing if no other songs are present
next song functionality
	don't' remove song
	fade song and mark next as currently playing
previous song functionality
	unmark current song as playing
	go backwards, unfade and mark as currently playing track
	start playing track