Add a test for checking blending on no-alpha contexts.
Fixup.
Update copyright year.
Merge pull request #774 from jdashg/backbuffer-tests

Add a test for checking blending on no-alpha contexts.
Added WEBGL_texture_from_depth_video extension proposal based on suggestions from Intel and buildAR.
Merge pull request #776 from kenrussell/texture-from-depth-video

Added WEBGL_texture_from_depth_video extension proposal based on suggest...
[WEBGL_texture_from_depth_video] update the URLs, definitions and terms.