Making the prompt boring and removing the ssh agent dance

as the prettiness was seemingly incompatible with latest SmartOS and the
ssh agent thing does not belong there, IMHO, and was almost certainly
*not* being depended on by anybody ssh'ing in as root.
Merge pull request #4 from modcloth-cookbooks/un-bork-prompt-drop-the-ssh-bit

Making the prompt boring and removing the ssh agent dance