Add softlayer driver

1 issue with this: Is just currently telling softlayer to setup a Ubuntu 14.04 image and run the get.docker.com script.
Both the image and the install script are customizable at the command line... but right now the default setup will not let you actually connect to the docker daemon without going and customizing the docker daemon settings (enable tcp).

Should also enable some tls stuff (or libtrust key auth stuff might be less painful).
Might be cool to get some of the libtrust key auth stuff merged into this branch so we, more easily, setup secure connections to the docker daemons created by hosts.