Closes #2; added album art download option
added last.fm, turntable.fm support. better var naming
updated documentation
bumped version to 0.3
link button to options page
fixed grooveshark duration & more variable/function cleanup
finished album artwork downloading
fixed turntable.fm album download
added songza.com support
added 8tracks.com support
added iheart.com support
fixed grooveshark is playing check