added specs for the message tag to verify #389
added specs for the message tag to verify #389

mpangrazzi/savon,enahum/savon,latortuga/savon,oafridi/savon,zerobatu/savon,Eric-Guo/savon,savonrb/savon,advishnuprasad/savon,rtrepo/savon,BlaneCordes/savon_vertex,SICSoftwareGmbH/savon,billr578/savon