Ipns name resolution

This branch is not yet complete, but before i move forward, the name resolution code (in namesys) needs some critiquing. There are also a decent number of bugfixes in this branch that i ran into while trying to get the code to a point where i could test ipns.
Yep. Would be awesome if IPFS becomes a really robust way to do key distribution though :) -- "running a key server" becomes as easy as linking to + pining objects :)