make terminator run tmux by default

no more terminator -e 'tmux -2'.
tmux will in turn run my default shell as a login shell.
using zsh now.
source custom git-prompt.zsh
aliases to edit/source ~/.zshrc
setopt sh_word_split

seeeems to work as expected... think i had a red herring when debugging
git-prompt.zsh and $RPROMPT last time.
new .gitconfig aliases