re added REST services for damage type and manufacturer resource
deleted unused files
fixed bug where discriminator has not been serialized with jms serializer if the abastract class extands another base class

 - included bugfix version of custom repository
 - see https://github.com/schmittjoh/JMSSerializerBundle/issues/292 for more details
added REST service for items
added REST service for weapons and shields
deleted unused files
unit tests not uses namespace