Allow config in a directory to separate out private dotfiles

Some people like to keep private and public dotfiles separate, so that they can have one backup store with all their credentials (personally, I use homesick gem and a private github repo for my credentials, and keep the rest of my dotfiles in a public one)

Would be nice if all the files in a ~/.bitbucket/ or ~/.bitbucket.d/ directory were loaded :)

Totally minor feature request btw. Not sure if I'll end up getting to it myself... heh