Added more detailed docs for setting up CMS
Show CMS page titles correctly (for brian)

Sorry, this should have been on another branch, but i got a bit
tangled.
Added newsletter signup field to registration
Added mailchimp API key etc for newsletter subscriptions
Subscribe/unsubscribe to newsletter

Don't think this actually works yet but wanted to commit what I've done.
Fixed newsletter subscription bugs, removed debug puts

The problem I was having (subscriptions not appearing on Mailchimp site)
turned out to be because I was using example.com addresses, which
Mailchimp ignores. So this was fixed by simply using a more real-looking
test address.

There was also a problem with filling in the merge field for "name", but
again, this was fixed by fixing up the name of the field on the
Mailchimp end; nothing was needed here.

So in the end, all I really did was remove the puts statements.
Merge pull request #27 from Skud/newsletter_at_signup

Newsletter at signup