Moved Vagrant v2 helper from command package to root Vagrant v2 package
Improves building of Config object
 * It's now possible to pass a directory. This enable re-use of pre-defined
   params filename without having to repeat it.
 * It's now possible to pass a callable (proc or lambda) to compute the
   path inside a method using some code.
Improved a bit english error message and added french translation
Added a description for the plugin
Fixed fectching of .vagrantuser current directory
 * We now uses the same rules as Vagrant for locating the Vagrantfile
   and the associated .vagrantuser parameters.
Fixed vagrant user parameters -p command
 * The project attribute is __current and not __project.
Updated README and CHANGELOG