deprecate old style validation

[elrayle]

deprecate validations in works.rb and use works_generic_file? works_generic_work? and works_collection? instead.

###  DEPRECATE each of the following
    # model validations
    def self.collection? collection
      return false unless collection.respond_to? :type
      collection.type.include? WorksVocabularies::WorksTerms.Collection
    end

    def self.generic_work? generic_work
      return false unless generic_work.respond_to? :type
      generic_work.type.include? WorksVocabularies::WorksTerms.GenericWork
    end

    def self.generic_file? generic_file
      return false unless generic_file.respond_to? :type
      generic_file.type.include? WorksVocabularies::WorksTerms.GenericFile
    end