Fix #2892: "rake travis" fails with can't modify frozen String
Fix #2892: "rake travis" fails with can't modify frozen String

Make an unfrozen copy of RUBY_VERSION so that rubygems version can
strip! it.

dtdream/fog,theforeman/fog,TerryHowe/fog,yyuu/fog,unorthodoxgeek/fog,bryanl/fog,brilliomsinterop/fog,fog/fog,phillbaker/fog,lwander/fog,displague/fog,adecarolis/fog,zephyrean/fog,sapcc/fog,backupify/fog,Ladas/fog,nandhanurrevanth/fog,kongslund/fog,dhague/fog,mohitsethi/fog,sideci-sample/sideci-sample-fog,MSOpenTech/fog,alphagov/fog,mohitsethi/fog,nandhanurrevanth/fog,adamleff/fog,surminus/fog,nicolasbrechet/fog,icco/fog,joshmyers/fog,dhague/fog,runtimerevolution/fog,pyama86/fog,SpryBTS/fog,seanhandley/fog,nandhanurrevanth/fog,dLobatog/fog,glennpratt/fog,martinb3/fog,martinb3/fog,theforeman/fog,phillbaker/fog,duhast/fog,joshisa/fog,dustacio/fog,plribeiro3000/fog,kongslund/fog,seanhandley/fog,eLobato/fog,covario-cdiaz/fog,10io/fog,adecarolis/fog,papedaniel/fog,nicolasbrechet/fog,covario-cdiaz/fog,dtdream/fog,pyama86/fog,ManageIQ/fog,nalabjp/fog,rackspace/fog,pravi/fog,lwander/fog,backupify/fog,github/fog,dustacio/fog,yyuu/fog,ManageIQ/fog,unorthodoxgeek/fog,joshisa/fog,10io/fog,brilliomsinterop/fog,MSOpenTech/fog,rackspace/fog,TerryHowe/fog,github/fog,asebastian-r7/fog,ack/fog,ack/fog,glennpratt/fog,alphagov/fog,Programatica/fog,Ladas/fog,adamleff/fog,SpryBTS/fog,mavenlink/fog,sideci-sample/sideci-sample-fog,b0ric/fog,zephyrean/fog,pravi/fog,brilliomsinterop/fog,duhast/fog,mitchlloyd/fog,eLobato/fog,zephyrean/fog,joshmyers/fog,displague/fog,dLobatog/fog,bryanl/fog,cocktail-io/fog,nalabjp/fog,asebastian-r7/fog,sapcc/fog,papedaniel/fog,plribeiro3000/fog,phillbaker/fog,mitchlloyd/fog,Programatica/fog,b0ric/fog,fog/fog,mavenlink/fog,runtimerevolution/fog,icco/fog,cocktail-io/fog,surminus/fog