fix Ruby 1.9 build for commit_button_spec
fix Ruby 1.9 build for commit_button_spec

justinfrench/formtastic,Guestfolio/formtastic,crashlytics/formtastic,ryanfox1985/formtastic,ryanfox1985/formtastic,EndingChaung/formtastic,pcreux/formtastic,ConferenceCloud/formtastic,thenthen8515/formtastic,thenthen8515/formtastic,nishaya/formtastic,sideci-sample/sideci-sample-formtastic,ConferenceCloud/formtastic,ryanfox1985/formtastic,Guestfolio/formtastic,EndingChaung/formtastic,Baltazore/formtastic,mikz/formtastic,Davidzhu001/formtastic,mikz/formtastic,Davidzhu001/formtastic,nishaya/formtastic,justinfrench/formtastic,paulodiovani/formtastic,justinfrench/formtastic,paulodiovani/formtastic