Reenable PHP test
Merge pull request #318 from rhy-jot/2013-11-18/reenable-php

Reenable PHP test
Revert "Reenable PHP test"

This reverts commit 7ecacd5d98295bef0ec63866a9b1a083655536a9.
Update buildstep URL and reenable PHP test
Force connection of stdin and stderr in the run command.

If stdin is closed, which is the case when pluginhook is called from an
interactive session, "docker run" does not connect stdin and stderr by default.
Fixes #323