PHPCR Fixes to make it work

Changes are basically correcting PHPCR mapping files, commenting method in BaseGallery which was causing troubles (we need to take a look to it) and correct wrong class names in repositories.
@dbu Okay, problem solved. I don't know why exactly but it is solved now (maybe some conflict between bundles). I've tested on DEV, and this method is working so this commit isn't needed. Maybe the problem with method was relative to something inside my cache or a bad configuration.

Tested on a scratch project and everything works perfectly skipping this commit  (so method is uncommented and executed).