Fixes issue #273 - translations for namespaced models. ActiveRecord uses i18n_key methods which return "namespace/model_name"("namespace.model_name" in rails 3.0.x) for Namespace::ModelName. Ransack should used the same pattern.
Merge pull request #275 from Bonias/fix-attributes-translations-for-namespaced-models

Fixes issue #273 - translations for namespaced models