Added a template .vimrc

This file is a template rather than a file that gets symlinked because
it supports site-specific vim configuration overrides.
I suppose that is true of the other configuration files as well, but
whatever.
Fix bash profile settings

Made the bash configuration completely .bashrc agnostic by pulling my changes
into .bash_profile; .bashrc is no longer tracked in the repo.
Moved bash-specific configuration from .profile into .bash_profile.
Quieter unalias commands