Add kerl (for Erlang) profile

- Custom profile for kerl setup and aliases
- Better profile loading block in the main script
Add bitbucket key to ssh profile
Add "new setup" script for new environments

Add a script that can quickly perform some initial setup in new
environments. Helps to prep new environments for quicker use. Eventually
I may want to move all this stuff into a true system for this kind of
thing though, like some Chef or Puppet scripts, or even a Vagrant box
that I can load up anywhere with VM software.