Merge pull request #1 from brianantonelli/master

Screen Calibration and Tracking Demo
Merge pull request #2 from brianantonelli/master

Fix for screen list empty helper
Added PR#2 to build, applied fix to all lists
Save calibratedScreens to localStorage.screens
Added screen size to localStorage.screens
More robust calibration persistence
Screen.offset() should be public
Discard old screen storage data
Added all invalid screen properties
API 0.7.7 update! Better Lists. Deprecation.
Added Screen.offset()
Cleanup and organization
Standardize invalid object properties