Fixed RenderTexture.resize so it now works across WebGL and Canvas. Uses the textureBuffer to resize and has a new optional 'updateBase' parameter which will set the new dimensions on the baseTexture as well. Fixes #746.
Added RenderTexture.clear - because, well, it's really useful :)
Merge pull request #747 from photonstorm/dev

RenderTexture.resize fix and RenderTexture.clear added.