Update to add default matching to gitconfig.
Modify bash_completion sourcing for Homebrew.

Actually attempt to check for the Homebrew prefix or else attempt to use
the common one at /usr/local. If it exists then source it.
Remove the personal custom.el

I am going to attempt to properly use homesick to track this.
Add .bash_login to be sourced for all shells.

Since the .bashrc has a check to not source (return) items for
non-interactive shells all the login for that should be placed into this
script.

Any machine specific login can be put into the local user's
.profile script (which is only sourced for interactive).
Add bash_completion to be sourced for interactive shells.