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.
not super clear what this means-- run the daemon, but without network and without mounting?

maybe `ipfs rpc` might be a better name. also