Add default values to args for page.save_content

(Otherwise creating a page doesn't work)
Fix typo on profile page, contributions sidebar

The number of pages modified and created were reversed.

They're still wrong somehow. To be dealt with later.
Fix pluralisation of the Series and Faculty models
Add maintainer field to Page (#165)

NOTE: when creating the column, make sure to specify a default
(1 should be fine, as that's the admin user).
Add series banner functionality

Kind of neat. Very versatile, and lots of room for expansion. If only
I had created an issue for this.
Remove sidebar from news page

Absolutely no use at the moment.

Also removed the comment box from the news view page