fix for issue #53
fix for issue #53

DateTime.to_soap_value now returns the correct timezone instead of just defaulting to UTC.

advishnuprasad/savon,oafridi/savon,SICSoftwareGmbH/savon,zerobatu/savon,mpangrazzi/savon,billr578/savon,savonrb/savon,Eric-Guo/savon,viniciusnz/savon,rtrepo/savon,kimptoc/Savon-with-username-token-digest,payfriendz/savon,enahum/savon,BlaneCordes/savon_vertex,travis-repos/savon,latortuga/savon