BBC-News/wraith — pull request #79 by JakeChampion (2013-12-30 19:09:11+00:00)
Title: [WIP] Use xvfb if it's in the user's PATH

Enables use of xvfb if it is in the user's `PATH` and the engine in use is `slimerJS`

https://github.com/BBC-News/wraith/pull/74#issuecomment-31325730