Fixed issue if the png_info was updated to change the size, we need to tall png_read_update_info to make sure the correct amount of memory was allocated.
Merge branch 'png-fix' of f:/bundle into png-fix
Merge pull request #322 from tfili/png-fix

Fixed possible write of unallocated memory
Add link to Cesium COLLADA-to-glTF converter to README.md
Changed company affiliation
Fixed crash if there is an animation with no keyframes.
Merge pull request #327 from tfili/no-keyframes-crash

Fixed crash if there is an animation with no keyframes.
https://github.com/KhronosGroup/glTF/issues/329