Ignore the reference environment in LaTeX to HTML conversion

At this point we just ignore the environment, Python is responsible for
inserting the relevant data in the database.
Implemented citations / references on the tag view page

So now we can toggle between a text and a list view.
Implemented toggle for the citation on a tag view page
Merge remote-tracking branch 'origin/references'

Merging minimal infrastructure changes necessary to dislpay
references in the stacks poject website