working new item button for nested (> 2nd level) collections
add phpdoc
update test for testgetChildFormBuilder
add test for AdminHelper
using PropertyAccessor to work with entity properties (correct way for guess add/remove methods names, see: Symfony\Component\PropertyAccess\StringUtil::singularify()) example: entity has property "categories" and must have method addCategory (not addCategories)
code cleanup remove dead code change backward сompatibility for AdminHelper::appendFormFieldElement() working collections of collections
fix add to collection null value
fix compatibility with doctrine 2.3
fix typo