Move emacs configuration to .emacs.d/personal.

This is for using the prelude scripts.
Move dotfiles into 'home' directory.

We are going to use the 'homesick' gem to actually manage the symlinking
of all of this.
Add Gemfile for 'homesick' gem.
Add gemrc file from Ryan Wood.
Add some bash completion files.
Add bu alias for bundle update.
Add irbrc file.