added an rspec_verify_rcov task and made it the default task to run
added an rspec_verify_rcov task and made it the default task to run

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