Port of prototype-rails' RJS and helpers to jquery

[brauliobo]

Based on both jrails gem and prototype-rails, I have been able to get prototype-rails replaced with its full API and using jquery with everything working: RJS and its helpers and other helpers from prototype-rails

The code is at: https://github.com/coletivoEITA/jrails

[jeremy]

Thank you @brauliobo !