Merge pull request #651 from starwed/get-method

Add get() method to crafty core
Merge pull request #652 from starwed/line-height

Add support for line-height and variant to the Text component
Fix example indentation and code style
Merge pull request #653 from potomak/documentation-minor-fix

Fix example indentation and code style
Merge pull request #657 from starwed/kill-ie8

Kill ie8 specific code in Crafty
Allow visibility MBR to be set manually

This patch adds properites to "2D" that indicate how far beyond an object's default dimensions the visible MBR should be.

These can be set with the method offsetBoundary.