*Removed support for DataMapper and replaced with ActiveRecord.
*Now generating a model will also generate the migration using .
*Fixed some typos on comments.
*Database connection directory structure refactored.
*Added Gemfile and rake file needed for gem sinatra-activerecord.
*App.rb now has a default root router for .
*Added validation tips for ActiveRecord.
*Controllers now have pluralized routes for each model. With that the gem needs a dependency  for pluralize methods.