add event tracking for GA
Merge pull request #1 from Evostance/master

Pull changes from Evostance
Merge commit '87ceb3c473b5994cef69ca616629c5883eae6a62'

Conflicts:
	manifest.json
	popup.html
Remove mac file
update readme.md
Fix invalid merge
fix loading not shown
Merge pull request #1 from anthonylau/master

Updating