With arguments, g acts like git.
Without arguments, it runs `git status`.
* Source functions/* after loading ZSH completion so `compdef` is available to g
alias
* Use a regular alias to make `s` short for `rspec`
* Use an `rspec` shell function to route to zeus when appropriate
* Removes confusion from `s` working differently than `rspec`
* Removes need to use a special alias to get zeus working