Ability to require the tasks without the hooks

[Startouf]

Inspired from Capistrano Passenger

Also, it is sad that this repo is a fork and not just a brand new repo. First, because it is definitely not the same thing, Second because it can cause a mess whith forking and contributing : I have forked + made a similar PR on the original npm repo, and then I couldn't fork this one since I already have a fork of the npm repo this repo is based on.