improve documentation for content_type, move into helpers section
improve documentation for content_type, move into helpers section

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