Add text to submit pages for rules

For all for review. 

Adds a rules box to subreddits which add text for it.  Works on regular non-subreddit submit pages (multis, frontpage) as well when you click a subreddit or type the name on the subreddit box (Typing in is a bit odd as you have to select away from the box for the rules to then load).

I believe @Deimos in specific was interested in this one.  Definitly needs some other eyes on it though.