message passing
item list persists
add basic icon
refactor a bit
add scraper service
use remote scraper
add tab page
add price refreshing
make scraping generic on a per-site basis
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