froots/sinatra-heroku-boilerplate — pull request #2 by SeanNieuwoudt (2012-06-13 08:07:28+00:00)
Title: Requiring datamapper no longer works - needs to be data_mapper

See the issue on stackoverflow: http://stackoverflow.com/questions/10951730/sinatra-config-ru-loaderror/10979121#10979121