config.ru

######################
# example from gembundler.com
# http://gembundler.com/sinatra.html
require 'rubygems'
require 'bundler/setup'

require 'sinatra'
require 'my_sinatra_app'
run MySinatraApp


######################
# what actually worked
require 'rubygems'
require 'bundler/setup'

Bundler.require

require 'my_sinatra_app'
run MySinatraApp

Gemfile

source :rubygems
gem "sinatra", "~>1.0"
gem "sinatra-content-for", "~>0.2", :require => "sinatra/content_for"
gem "sinatra-subdomain", "~>0.1.0", :require => "sinatra/subdomain"
gem "dm-core", "~>1.0.2"
gem "dm-aggregates", "~>1.0.0"
gem "dm-migrations", "~>1.0.0"
gem "dm-mysql-adapter", "~>1.0.0"
gem "dm-pager", "~>1.1.0"
gem "dm-timestamps", "~>1.0.0"
gem "haml", "~>3.0.18"
gem "rack-ssl-enforcer", "~>0.1.8"
gem "pony", "~>1.0"
gem "RedCloth", "~>4.2.3"