Tidied up and optimised Sprite._renderCanvas. Removed lots of temporary vars that weren't needed (texture, crop, frame, transform, child), reduced all the drawImage calls down to just one. Removed redundant baseTexture.hasLoaded check.
Small fix to reset crop x/y from tinted sprites, also allows us to remove one more temporary var.
jshint fixes
Small docs fix for #855
Merge pull request #854 from photonstorm/dev

Tidied up and optimised Sprite._renderCanvas. Removed lots of temporary ...