PIM-3237: Remove BasFilterSpec
Merge branch 'PIM-3237' of github.com:akeneo/pim-community-dev into PIM-3237

* 'PIM-3237' of github.com:akeneo/pim-community-dev:
  PIM-3237: Remove final on operators
  PIM-3237: Fix phpspecs
  PIM-3237: Add phpspec
  PIM-3237: Remove base filter and add some specialized filters
  PIM-3237: fix string filter on like operator
  PIM-3237: add specs
  PIM-3237: FIx PR comments
  PIM-3237: Add spec for orm
  PIM-3237: Use constants to describe operators
  PIM-3237: Move filter transformation to catalog bundle