Please add swank.live

Please add the swank.live which can be found here https://github.com/cbaggers/swank.live

This exposes a few helpers that make livecoding with slime/swank a little easier.

`#'update-swank`: Call this function to get swank to handle requests. Put this in your main game/demo/etc loop to keep the repl live whist your code runs.

`#'peek`: A quick way of calling #'swank:inspect-in-emacs

Thanks folks
