Making it more OS independent
Allow multiple folder of global hooks

This allows a user to have multiple folder of global hooks by adding to
the git configuration the path
`git config --add hooks.global </PATH/TO/FILE>`

This allows for multiple groups of hooks. For example, Rails hooks got
have in their own project
`git config --add hooks.global </PATH/TO/RAILS/HOOKS/>` and then have
rails specific hooks.