Updated icon due to new toolbar icon spec in Brackets.
Active icon.
Active icon.
Removed structural css as now  extension devs only has to specify background properties and not structural properties.
Made the icon slightly larger.
Update icon to make it more like devdocs.io's favicon.
Updated CSS due to new sprite.
Tweaked icon.
Tweaked icon.
Tweaked icon.
Merge pull request #2 from larz0/master

Updated icon according new toolbar icon spec