[POC][WIP] PIM-3277: introduce PimResourceBundle

The goal of this PR is to introduce the PimResourceBundle which will help us to dispatch normalized events on every create/update/delete. 

PHASE I: introduce the PimResourceBundle
 - [x] introduce the PimResourceBundle
 - [ ] discuss about the namespaces
 - [ ] discuss about moving the SmartManagerRegistry inside this bundle
 - [x] provide a simple example on one of our bundle or controller/manager (done with AttributeManager)
 - [x] provide a simple example on one of our import (direct to db mode)
 - [ ] specs
 - [ ] doc

PHASE II: homogenisation of the business managers to make them implement a common interface
PHASE III: make all managers/controllers use this system
PHASE IV: homogenisation of the repositories

![unnamed](https://cloud.githubusercontent.com/assets/3691804/4736502/f80b6088-59ec-11e4-9009-69f3934b9f02.gif)

 You already have a registry form attribute, why don't you use a generic registry (something like [that](https://github.com/Sylius/Registry) ;)) ?