moved files into a package directory
changed example models to automobiles; added sorting functionality; DRYed up form processing in edit() controller methods; DRYed up field validation; other small fixes/improvements/refactors
added model factory method to controller base class so we can call model functions in one line without having to instantiate the class first
added new body_type entity as required parent of car, and made that sortable (and changed manufacturers to not-sortable
changed colors to a many-to-many relationship (with cars)
refactored all database table and field names (and php variables) from CamelCase to lowercase_underscore
added front-end page (just a stub, does not have much functionality)
refactored pkg controller updgrade functions
changed library function name to CamelCase
updated README
added link to old tag in readme