hooks

Available hooks are:

* pre-command
* post-command
* pre-hook
* post-clone
* post-clone-retired
	Use this if you need to operate on different git repositories after cloning.
	This hook can be useful if your configuration needs some remote
	repositories, but you do not want to include it into your vcsh
	repository. For instance, if you use vim plugins manager (vundle,
	NeoBundle), zsh configuration frameworks (oh-my-zsh, prezto), etc.
* pre-enter
* post-enter
* pre-run
* post-run
* pre-upgrade
* post-upgrade