Fix register_valid logic

lib/rails_api_authentication/authable.rb

@@ -123,7 +123,7 @@ module RailsApiAuthentication
 
       def register(name, password, attrs={})
         raise(UserError.new(400, '-1', 'password is blank')) if password.blank?
-        valid! name, attrs.delete(@valid_key) unless @register_valid
+        valid! name, attrs.delete(@valid_key) if @register_valid
         user = self.create!({auth_key => name, @auth_password => generate_password(password)})
         user.token = AuthToken.create(self, oauth_params(attrs).merge({ oid: user.id }) ).token
         user