Initial draft of 8tracks connector. Need to work on trigger and duration calculation
Finish 8tracks support. Since no duration is on the page, I estimate
track length to get a "good enough" scrobble time.
Merge branch '8tracks' of git://github.com/runkalicious/Chrome-Last.fm-Scrobbler into runkalicious-8tracks

Conflicts:
	inject.js
	options.html