Dummy implementation of the FileStorage interface.
Implementation of the CC.instance method.
Add a shared file_storage folder in the ruby workspace.
Implement missing methods and fix existing ones.
Require the file_interface file somewhere.
Add convenience methods to create and delete a file in the TestsHelper.
Merge remote-tracking branch 'origin/topic/bf_file_storage' into develop

* origin/topic/bf_file_storage:
  Add convenience methods to create and delete a file in the TestsHelper.
  Require the file_interface file somewhere.
  Implement missing methods and fix existing ones.
  Add a shared file_storage folder in the ruby workspace.
  Implementation of the CC.instance method.
  Dummy implementation of the FileStorage interface.