Forgot to add "FAIL" to failing messages logged to console.
Merge pull request #681 from kenrussell/fail-message

Forgot to add "FAIL" to failing messages logged to console.
Added more debug logging to the premultiply alpha test.
Merge pull request #682 from toji/premultiply-alpha-logging

Added more debug logging to the premultiply alpha test.
Add missing explanations for sync related functions

There's still an open question about whether waitSync for waiting on the
GL server is at all useful for WebGL, but document it alongside the other
sync functions.
Merge pull request #683 from NVIDIA/webgl2-sync-spec

Add missing explanations for sync related functions