add receiver and receiver/client models
add change_set, fixes model_id, migration, message
rename message_builder to message_packer
add message_unpacker
move find_change_set and find_client_model_id to message_unpacker
add methods model, model_attributes to unpacker
add message_unpacker#create_model
add receiver/create_client_model middleware
add message_unpacker#find_model_by_change_set
rename model to model_configuration in message_unpacker
remove middleware assign_change_set, add middleeware find_model_by_change_set
remove assign_client_model_id middleware, add find_model_by_server_model_id middleware
add update_client_model middleware
fixes create_client_model middleware
add commit_change_set middleware
add transaction middleware
add message status
add remove_client_model middleware
add integration specs for receiver/client
Merge pull request #1 from evrone/client_receiver

Client receiver