Reduced iteration count on long running tests.
Added tests with old iteration counts back into extra/
Optimize context-creation-and-destruction test

This test is very long-running, and taking out the unnecessary Uint8Array
construction on every iteration reduced run time by roughly 5% on a
high-end workstation. Additionally, query maximum texture size only once
for some more marginal gains. The changes have no significant effect on
test coverage and are also done to the 1.0.2 version of the test.
Moved common test code to iterable-test.js, ditched iFrame approach
Merging Olli's optimization
Renamed 'console' variable that was causing problems with test harnesses
Merge pull request #425 from toji/no-console

Renamed 'console' variable that was causing problems with test harnesses
Removed need for custom shaders in multisample-corruption test
Merge pull request #423 from toji/test_iterations

Reduced iteration count on long running tests.
Per request from Jeff Gilbert from Mozilla, specified that the context type 'experimental-webgl' is an alias for 'webgl'.
Merge pull request #426 from kenrussell/experimental-webgl

Per request from Jeff Gilbert from Mozilla, specified that the context t...
Added regression test for Chromium Issues 320724 and 322726.

Also fixed a bug in how webgl-test-utils.js was invoking requestAnimationFrame and cancelAnimationFrame.
Fixed bug accidentally introduced in last commit; need call instead of apply.
Merge pull request #427 from kenrussell/chromium-regression-test

Added regression test for Chromium Issues 320724 and 322726.