build all editor stylers for the standalone editor build - fast
Bug 451606 - Failures go unnoticed when too many tests fail

* The `mochaResults.reports` field becomes large when many tests fail. Avoid
  blowing Sauce Labs request size limit by removing some reports.

Squash into 'Failures go unnoticed'
Bug 451606 - tolerate a bad/missing Sauce result

* If test page doesn't return the expected results shape, generate an xunit
  report to ensure that the breakage will appear in Hudson.