Command hooks

[ligaz]

Implement before and after hooks for each command. Those should be scripts that will be loaded and executed before and after each command gets executed. We will need to have a set of default hooks and move our platform-specific files logic as such hook. Custom project hooks will live in the hooks folder of the project.

[ErjanGavalji]

The preparation of a project when it contains modules, applicable for both the platforms, but having different files is an interesting moment. It might be good for the CLI to search for scripts of the kind in the npm package of the module.