Update test helpers
Update test helpers

* Force column reset in Rails >= 3.1
* Reuse another helper method
mehulkar/paperclip,soramugi/paperclip,Sporky023/paperclip,agcantarelli/paperclip,crowdtap/paperclip,degica/paperclip,gfvcastro/paperclip,gfvcastro/paperclip,keathley/paperclip,felipemathies/paperclip,felipemathies/paperclip,12spokes/paperclip,bdewater/paperclip,tylerwillingham/paperclip,mehulkar/paperclip,frankpinto/paperclip,aditya01933/paperclip,InesCARodrigues/paperclip,alexandrz/paperclip,manorie/paperclip,onursarikaya/paperclip,carnivalmobile/paperclip,aditya01933/paperclip,betesh/paperclip,onursarikaya/paperclip,manorie/paperclip,mrb/paperclip,Leadformance/paperclip,agcantarelli/paperclip,crowdtap/paperclip,rpbaptist/paperclip,victorngkp/paperclip,frankpinto/paperclip,howaboutwe/paperclip,maintux/paperclip,Cohealo/paperclip,carnivalmobile/paperclip,cmaion/paperclip,pandamako/paperclip,hooroo/paperclip,mrgilman/paperclip,dgynn/paperclip,alexandrz/paperclip,keathley/paperclip,betesh/paperclip,ScotterC/paperclip,raow/paperclip,tylerwillingham/paperclip,medcat/paperclip,best-teacher/paperclip-old,soramugi/paperclip,justanshulsharma/paperclip,sideci-sample/sideci-sample-paperclip,mdkalish/paperclip,pcorliss/paperclip,rpbaptist/paperclip,maintux/paperclip,victorngkp/paperclip,bdewater/paperclip,ScotterC/paperclip,joshisa/paperclip,cmaion/paperclip,zurb/paperclip,greatbody/paperclip,dgynn/paperclip,freeslugs/paperclip,danielwanja/paperclip,Sporky023/paperclip,InesCARodrigues/paperclip,mdkalish/paperclip,Leadformance/paperclip,tiegz/paperclip,Cohealo/paperclip,mrgilman/paperclip,degica/paperclip,pandamako/paperclip,medcat/paperclip,justanshulsharma/paperclip,freeslugs/paperclip,raow/paperclip,sopheak-se/paperclip,tiegz/paperclip,sopheak-se/paperclip,joshisa/paperclip,greatbody/paperclip,mrb/paperclip,zurb/paperclip