fix rake task for ruby 1.8
fix rake task for ruby 1.8

defsprite/sinatra,guidohcosta/sinatra,JonRowe/sinatra,d-bot/sinatra,nju520/sinatra,ryanshaw/sinatra,d-bot/sinatra,autopp/sinatra,cyberid41/sinatra,ktw1222/sinatra,ABaldwinHunter/sinatra-classic,kgrz/sinatra,kyontan/sinatra,Callygraphy/morrissey,ksw2599/sinatra,frechei/sinatra,laplaceliu/sinatra,trexnix/sinatra,eileencodes/sinatra,siberianbear/sinatra,Rayheng/sinatra,mwpastore/sinatra,laplaceliu/sinatra,marocchino/sinatra,JonMidhir/sinatra,QLGu/sinatra,sethuster/sinatra,nicoayala/sinatra,wzheng1/sinatra,mwpastore/sinatra,trexnix/sinatra,ktw1222/sinatra,guidohcosta/sinatra,burningTyger/sinatra,lastcat/sinatra,frechei/sinatra,nju520/sinatra,nicoayala/sinatra,howtolearntocode/sinatra,RosenDimov/sinatra,jkowens/sinatra,DoraALin/sinatra,Wirachmat/sinatra,ABaldwinHunter/sinatra-classic,cyberid41/sinatra,miyazawatomoka/sinatra,gferguson-gd/sinatra,kumji/sinatra,dariubs/sinatra,jkowens/sinatra,ganmacs/sinatra,jenalgit/sinatra,kumji/sinatra,porras/sinatra,davydovanton/sinatra,emiliocorpus/sinatra,jkowens/sinatra,davydovanton/sinatra,midorineko/sinatra,DoraALin/sinatra,miyazawatomoka/sinatra,JonRowe/sinatra,defsprite/sinatra,RosenDimov/sinatra,ganmacs/sinatra,ryanshaw/sinatra,ksw2599/sinatra,mwpastore/sinatra,JonMidhir/sinatra,porras/sinatra,wzheng1/sinatra,Wirachmat/sinatra,sinatra/sinatra,Rayheng/sinatra,burningTyger/sinatra,emiliocorpus/sinatra,dariubs/sinatra,gferguson-gd/sinatra,burningTyger/sinatra,QLGu/sinatra,jenalgit/sinatra,sethuster/sinatra,JonMidhir/sinatra,autopp/sinatra,sinatra/sinatra,eileencodes/sinatra,kyontan/sinatra,midorineko/sinatra,lastcat/sinatra,howtolearntocode/sinatra,siberianbear/sinatra