Updates domain to li3.me

* Change domain referenced from lithify.me (currently unregistered as of 2014-01-04 and not resolving) to li3.me (currently resolving just fine)

It's possible I've got the wrong end of the stick, but the docs at http://li3.me/ still point to lithify.me

See also https://github.com/UnionOfRAD/li3_docs/pull/37