Commits on Sep 18, 2018

1. Fix import regression which disallow to slicer model validate.

   `cubes.metadata.*` is added to `cubes.metadata` because the validate_model
   was previously a function part of it (ascendance compatibility).
   
   Then, it impacts necessarily the new import added to
   `cubes.slicer.commands`.
   
   In the function `cubes.slicer.commands`, the packages `cubes` and
   `cubes.providers` are no longer available, the link to the owned
   functions are so rebuild.

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