render_to_response does not work on newer django, so it needs to be
replaced. And using a speicfic context actually overcomplicates things,
it's easier to just use a wrapper function. For those cases where we
don't need NavContext, just use render() (the new shortcut function from
django), which also removes the need to use RequestContext.
This lets us separate things like project news from other OSS and from
commercial postings, for example, allowing for people to subscribe to
different feeds with just the parts they are interested in.
This one will validate that the url is under /accounts/, which is
the only part we are going to be excluding from caching once we
move the website to https-only.
