Apply Srdjan's patch
Fix typo
Merge pull request #28 from johnmccutchan/master

s/num/double
Updated documentation
Add addBody interface to world. Allow for custom Body subclasses.

Issue #8
Update to latest SDK: r30798
Add testPoint to Fixture
Add raycasting support. Fixes issue #29
Use vector_math for transform operations.

Fixes issue #20.