Revert "More modern way of aliasing `hub` to `git` [zsh]"

Turns out this has too many side effects (git aliases stopped working,
zsh-git-prompt stopped working...).

This reverts commit c33b7ac17b7d1aef14d8105f10ea7483b9f58c6b.
Add gl='git -l' alias [zsh]
Make sure to have wrapscan on [vim]
Remove --fail-fast from .rspec [rspec]

It's super useful in guard-rspec, but not so much when running rspec
from the command line.
Readable BigDecimal#inspect output in IRB [irb]