Adds NG states to php-formula

This rather big pull requests adds NG states to the php formula much in the same way we did with NGINX. It does require the helium release (or an updated pillar module) in order to take advantage of `salt.modules.pillar.get(merge=True)`.
I am not at all in love with this part. It would be extremely helpful to have some part of os.path exposed in jinja so proper path joins could be made.