Updated README.
Fixing a small typo bug.
Merge pull request #95 from dariomanesku/master

Fixing a small typo bug.
Added ability to choose renderer backend in runtime.
Fixed sin(y) sign in mtxRotateXY().
Cleanup.
Merge pull request #96 from dariomanesku/master

Fixed sin(y) sign in mtxRotateXY().
Added AABB overlap test.
Cleanup.
Moved fpumath to bx.
Updated 07-callback example.
Switched logic to prefer DX11 renderer on Win8.
Merge branch 'theirs'
Added C99 compatible header.
Updated README.
Added interfaces to C99 header.
Cleanup.
Added documentation into C99 header.
Cleanup.
Updated C99 header.