Use BlankObject + method_missing instead of DelegateClass
Use BlankObject + method_missing instead of DelegateClass

DelegateClass + ActiveRecord::Base was not working with method delegation, and
after a lot of debug I still couldn't find the real reason behind it. I will
be investigating this further.

Besides that, this will allow us to easily integrate with other ORMs, not only
ActiveRecord.

All tests are now green on both 1.9.2 and 1.8.7.

raphaelcosta/i18n_alchemy,carlosantoniodasilva/i18n_alchemy