Implementation of the nokia.contacts localmsg server

In this pull request I'm just using a fake contact, I'll hook up the mozContacts API in another pull request.
There are still a couple of messages not implemented (getFirst and getNext), but they should be trivial now (the hard part was Notify).
There are still a couple of things unclear to me, but I think we can figure them out later when needed.
This block of commented-out tests could use a comment explaining why they're commented-out and what our plans are to enable them.