Rename tmux window to current directory

And keep the current command intact
Add /usr/sbin to PATH

Why doesn't zsh have this in it's path?!
Remove unused cd and ls aliases
Add `:Pry` and `:MinitestFocus`

`:Pry` => opens up pry on a specific line
`:MinitestFocus` => focus on the current test
Remove `h` function

`hub` slowed down the zsh startup-time drastically