Merge pull request #9 from txusinho/master

Fixed old extensions bug, and added leaderboards to Google Play Games
Fixed "RefreshFullScreen" typo.
Fixed error that causes an alert in strict mode
Added 2 missing methods of the ads service (onBannerReady/onFullScreenReady)
Updated .capx with ads section
Update edittime.js

fix wrong file name in dependency
Rename page_achivements.css to page_achievements.css
Update main.css

Fix wrong file name in @import
Merge pull request #21 from nhpkhanh/master

Fix typos in dependencies
Update README.md