Pass title to Parsoid

This should make some magic, like {{FULLPAGENAME}}, work.

Revisions are not really "tied" to a specific page. In future, they may appear
on multiple boards (I think), so we may have to rethink how this works then.

For now, as long as a revision is only on 1 page, we can just use $wgTitle & its
JS equivalent to toss in the correct title; once that changes, we'll have to add
the specific Title as 4th argument to the parsoid functions

Change-Id: I6bf62d6cb35b90ca42ee2cf0fabc30b9f78d2d15
Merge "Pass title to Parsoid"