Debounce centerFrame and only update viewport when viewport modifed more then
50 px , fixed #11
Signed-off-by: Rack Lin <racklin@gmail.com>
* Only offer noglfx when we are actually loading glfx.
* Use 100px as it is roughly the viewport size
merge #12
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages

Conflicts:
	js/player.js