remove useless variable channelManager
refactor tree associate javascript, still need to merge associate and
merge associate that have same behavior now
use classic form binding to set product's categories, remove useless
association code
add hidden categories field
remove setCategories method from product manager and remove useless save
parameters
add hidden categories field
allow to configure the associate script
use the same script in simple product associate and mass action
remove useless script (refactored)
Merge branch 'master' into product_form_categories
use the same categories field for enrich and import
fix issue with remove a product from a category
 add behat scenario to classify product into categories
add method to allow to manipulate categories on product edit
add method to select a tree in web user
Merge branch 'master' into product_form_categories
Merge pull request #322 from akeneo/product_form_categories

WIP : refactor product form (association with categories)