move refresh to background script
start graph, did some stuff
Added file "alt icon" that is used when app can be used with active tab.

browserAction icon uses alt icon currently for amazon and ebay (sites in the scrapeDefinitions)
	- content_script calls refreshIcon in backgroundScript when page is loaded
Merge branch 'master' of github.com:W-General/cheaper-plz

Conflicts:
	app/scripts/backgroundScript.js