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.
Im still somewhat a fan of the Matches/CanResolve method. It lets us do a simple check without comitting to actually resolving something