Added module commands integration

Allow modules to register commands into artisan while regitering into
the app
Update README for adding Commands documentation
Update README for path selection in manual mode
Fix manual finder with many path bug

Allow path specification for manual module listing. Usefull for loading
modules in differents paths.
Fix Doc typing error
Added Alias registration
Fix Missing use on Alias Registration
Update README for adding Alias doc
Merge pull request #68 from Ifnot/master

Add Module Commands support