[ruby rails] client_side_validations 했을때 formtastic 에러나면

http://stackoverflow.com/questions/6438449/rails-3-uninitialized-constant-formtasticformbuilder-error-after-deploying

다른젬이 formstastic 1.X 버전을 쓰고 있어서일수도있다.

3.0.5를 쓰자.