Proposal: Adding Rendering Performance Tests for Components

The rendering performance tests are based on Chromium telemetry and help check performance regressions across commits. 
A new grunt task has been added that generates temporary files, runs the performance tests for them in saucelabs and reports back the results. The results are stored in a CouchDB Database. The CouchApp in the same database is used to view this data over commits.
(The couchDB account is under my name and before the final merge, needs to be changed to a couchDB that bootstrap owns). 
This is based on http://axemclion.github.com/bootstrap-perf and is inspired by the work done with http://bench.topcoat.io. 
To run the performance task, run `grunt connect perf`. I have not yet hooked it into travis yet, will do that once this proposal to add rendering tasks is accepted.