Merge pull request #47 from dariomanesku/master

Updates on 14-shadowvolumes.
Fixed warning: operation on ‘currentDirection’ may be undefined.
Updated fpumath.
Removed nonsense code.
Added vertex welding support.
Merge branch 'master' of github.com:bkaradzic/bgfx
Cleanup.
Small refactor regarding shadow volume mtx computation.
Minor fix.
Cleanup.
Fixed resource cleanup.
Fixed reflection in 13-stencil.
Binary shaders updated.