Added Deferred 0.6.1.
Core: moved register() to a lib.
Register: added debug output.
Merge pull request #23 from devo-ps/master

Sync with master
Core: moved mixable to a lib.
Core: moved mixable to plugins.
Core: added deferred to carcass core; also exposed a promise with carcass itself as the resolve value.
Merge pull request #24 from devo-ps/promise

Promise