Hash conversion support for classes that inherit from entities

Signed-off By: Fellipe Souto <fllsouto@gmail.com>
Signed-off By: Renan Fichberg <rfichberg@gmail.com>
Updated activesupport version

Signed-off By: Fellipe Souto <fllsouto@gmail.com>
Signed-off By: Renan Fichberg <rfichberg@gmail.com>
FactoryGirl updated

Signed-off By: Fellipe Souto <fllsouto@gmail.com>
Signed-off By: Renan Fichberg <rfichberg@gmail.com>
Version bump