[refacto] Split common package
	- Error stuff move to error package
	- Event related classes moved to a new event package
	- HTMLUtils move to the widget package
[fix] GoogleAnnalytics : Tracked page if correct link in GA control panel[fix] GoogleAnnalytics : Tracked page if correct link in GA control panel
Merge pull request #17 from fdumay/master

Refacto common package