Add Post entity. Relate it to User.
Remove User#addGroup/removeGroup
Add Thread entity
Merge branch 'master' into post-thread

Conflicts:
	src/Network/StoreBundle/Entity/User.php
Schools: Create structure
Schools: Add parser for vk database
Schools: Add fixtures
Schools: Add CategoryController
Schools: Add CategoryType
Schools: Add template for category_widget
VDolgahAdmin: solve problem with writers for collection types

problem: field not added if property writable via
"add" and "remove" methods.
example: $cities, addCity($c), removeCity($c), getCities()
Schools: Add posibility to hide field in child form
Schools: Add SchoolAdmin
Extracts the permissions setting

Also add permissions setting after cache clearing
Merge branch 'master' of github.com:koninka/fefu-social-network
Add Paginator as Service
Schools: Add CategoryService
Schools: use CategoryService in CategoryController
Merge branch 'post-thread' of https://github.com/rotanov/fefu-social-network
Use ReflectionClass->getShortName instead basename