updating readme to reflect bundling of backbone 0.9.2
updating readme to reflect bundling of backbone 0.9.2

ipmobiletech/backbone-rails,codebrew/backbone-rails,ipmobiletech/backbone-rails,contently/backbone-rails,ArthurN/backbone-rails,ArthurN/backbone-rails,contently/backbone-rails,codebrew/backbone-rails,ipmobiletech/backbone-rails,codebrew/backbone-rails,contently/backbone-rails,contently/backbone-rails,ArthurN/backbone-rails