A brand new planet manager and runtime

A brand new planet manager and runtime

Completely restructure the planet postgresql code -- it was definitely
getting old.

A new registration interface makes it much more friendly, and gives the
user a chance to see what's going on.

A new moderation interface allows for a better view of what's happening
with the feeds that are pending, as well as the ability to give a message
to the subscriber when rejecting a blog.

Aggregation uses the same framework, but now runs as a django management
command, and also supports async parallelism when fetching the blogs to
make it much faster (since most of them time out on http).

Planet itself is now rendered in django, and expects a Varnish sitting in
front of it, to which it will generate purges properly. Makes any changes
made in the interface more or less instant, instead of having to wait for
15 minutes.