Martin Nash

Here is the full stack trace ``` ActiveRecord::AssociationTypeMismatch: Role(#70173822757240) expected, got Symbol(#70173818545420) /Users/nash/.rvm/gems/ruby-2.0.0-p353/gems/activerecord-4.1.1/lib/active_record/associations/association.rb:216:in `raise_on_type_mismatch!' /Users/nash/.rvm/gems/ruby-2.0.0-p353/gems/activerecord-4.1.1/lib/active_record/associations/collection_association.rb:356:in `block in replace' /Users/nash/.rvm/gems/ruby-2.0.0-p353/gems/activerecord-4.1.1/lib/active_record/associations/collection_association.rb:356:in `each' /Users/nash/.rvm/gems/ruby-2.0.0-p353/gems/activerecord-4.1.1/lib/active_record/associations/collection_association.rb:356:in `replace' /Users/nash/.rvm/gems/ruby-2.0.0-p353/gems/activerecord-4.1.1/lib/active_record/associations/collection_association.rb:41:in `writer' /Users/nash/.rvm/gems/ruby-2.0.0-p353/gems/activerecord-4.1.1/lib/active_record/associations/builder/association.rb:118:in `roles=' /Users/nash/.rvm/gems/ruby-2.0.0-p353/gems/simple_roles-0.0.12/lib/simple_roles/many/roles_methods.rb:71:in `add_roles' /Users/nash/dev/rails/ywk/db/seeds.rb:17:in `'...