Ninja world collision to check right and bottom bounds

The world collision algorithm need to check the right and bottom of the
bounds in case the bound’s x or y are not equal to 0
Group.getAt comparison updated (fixes #578)
Fixed the IE11 version check (fixes #579)
Merge pull request #571 from dreadhorse/dev

Ninja world collision to check right and bottom bounds
Group enableBody parameter was incorrectly assigned to the debug var (thanks BurnedToast, fix #565)
Fixed Tile callback check in Arcade Physics (fix #562)
Add destroy methods to Ninja Body, AABB and Circle

The Sprite.destroy() method calls the Body’s destroy() method if a body
exists. If using Ninja physics, destroying a Sprite will not work,
since the destroy method wasn’t implemented in Ninja’s Body.

Also added destroy() methods to Ninja’s AABB and Circle. Tile already
have a destroy() method.
Merge pull request #581 from dreadhorse/destroy

Add destroy methods to Ninja Body, AABB and Circle