move messages models to message-box module
move messages models to message-box module

jfederico/Hilary,ExC0d3/Hilary,mrvisser/Hilary,stuartf/Hilary,simong/Hilary,jfederico/Hilary,timdegroote/Hilary,Orodan/Hilary,ExC0d3/Hilary,mrvisser/Hilary,nicolaasmatthijs/Hilary,stuartf/Hilary,timdegroote/Hilary,simong/Hilary,nicolaasmatthijs/Hilary,Orodan/Hilary