Add a shader with conditional side effects to the conditional discard bug
shader test.
Merge pull request #401 from jamiemadill/conditional-discard-side-effects

Test conditional discard with side effects
Add tex-image-and-sub-image-2d-with-svg-image.html and supporting files to test SVG images as textures
Merge pull request #403 from progers/master

Add a new test for SVG image textures.