Add ParserFunctions role
Add ParserFunctions role

It seems worth flagging as an "important extension", and currently the list of
roles is the only such list in Vagrant. Since I was adding the role anyway, I
changed proofreadpage to use the new role.

Change-Id: I7db0fe63c1647ae006b9e5a809b43c5a3142f7e0

stuartbman/mediawiki-vagrant,HarriAlasi/wiki3dviewer,ankita-kumari/mediawiki-vagrant,stuartbman/mediawiki-vagrant,HarriAlasi/wiki3dviewer,physikerwelt/DRMF-vagrant,stuartbman/mediawiki-vagrant,HarriAlasi/wiki3dviewer,physikerwelt/DRMF-vagrant,ankita-kumari/mediawiki-vagrant,HarriAlasi/wiki3dviewer,huit/mediawiki-vagrant,physikerwelt/DRMF-vagrant,stuartbman/mediawiki-vagrant,huit/mediawiki-vagrant,huit/mediawiki-vagrant,physikerwelt/DRMF-vagrant,huit/mediawiki-vagrant,HarriAlasi/wiki3dviewer,stuartbman/mediawiki-vagrant,wikimedia/mediawiki-vagrant,huit/mediawiki-vagrant,ankita-kumari/mediawiki-vagrant,ankita-kumari/mediawiki-vagrant,wikimedia/mediawiki-vagrant,stuartbman/mediawiki-vagrant,wikimedia/mediawiki-vagrant,HarriAlasi/wiki3dviewer,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,ankita-kumari/mediawiki-vagrant,stuartbman/mediawiki-vagrant,HarriAlasi/wiki3dviewer,ankita-kumari/mediawiki-vagrant,wikimedia/mediawiki-vagrant