Allow overridden request methods

[Jared Scheel]

That's a great point, DELETE does often get ignored. I like the idea
of having a reserved property in json, but it still relies on your
ability to push json to couchdb. Somehow the core REST interface
should allow this as well. (Once again, sorry if this doesn't fit in
the thread right, I sent a message to the list admin, so hopefully I
can get this worked out :P )