Rename testharness_bootstrap.js to bootstrap.js
Update reference to bootstrap.js in testcases
Load web-animations.js in bootstrap
Remove web-animations.js script from testcases
Add a nopolyfill flag to allow manual loading of the polyfill
Remove calls to console.log from test-runner and testharness_timing
Reimplement nochecks flag to toggle loading of '-checks.js' files
Specify nochecks flag for tests with no -checks.js file
Stop trying to post results once post failures are detected
Load polyfill directly in manual tests
Merge pull request #274 from dstockwell/boot

Resolve some outstanding issues in test-runner and bootstrap.