Merge pull request #272 from WellingGuzman/welling

Fix offscreen navbar issues #270
3d bug fix, add more effect, and others

1. fix 3d effect for off-screen-nav
2. added minimise then flip
3. moving the staggering li amount to variable
4. added missing semi-colon;
Merge pull request #275 from wonglok/master

3d bug fix, add more effect, and others