Suppress JS errors in Poltergeist
Suppress JS errors in Poltergeist

This should be handled by visionmedia/mocha#868, but
PhantomJS probably still has a version of WebKit with
https://bugs.webkit.org/show_bug.cgi?id=67119
uken/konacha,hugocorbucci/konacha,hugocorbucci/konacha,jfirebaugh/konacha,hugocorbucci/konacha,uken/konacha,uken/konacha,jfirebaugh/konacha,jfirebaugh/konacha