Fix JS spec env.

* remove unnecesary files
* add quint stylesheet
URL-encode branch name for status images.

Camelcased all entries in the status image selection menu for
consistency.

Fixes travis-ci/travis-ci#2265
Don't allow Sauce to fail
Sauce username seems to be wrong, update it
Fix spelling error in cancellation.
Merge pull request #273 from simi/clean-spec-env

Fix JS spec env.