Added in RIGoogleAnalyticsTracker:
	- Track screen;
	- Track Event;

RIAppDelegate:
	- Uncommented the code in order to get the plist file

RITracking:
	- Added comments in the header file;
	- Added the track screen method;

RITrackingTests:
	- Implemented the testTrackEvent
	- Commented a piece of code in testGoogleAnalyticsTrackerInitialization (pending solving)
Corrected the comments in RiTracking
Changed file name
Fixed name.