0-70-stable branch

I fixed a couple issues:

1) The gem was not loading any decorators or overrides and didn't include an engine name.  This lead to inconsistent behavior depending on whether you were in development/production env.
2) The admin/shipping_methods new/edit form was not working b/c the select tag was generating the wrong values for each options.  Instead of the "Calculator::Ups::Ground" format, it was generating "Ups/Ground" which would error out in an uninitialized constant error.