def increment_bitfields column_name, *fields
      mask = self.class.increment_mask_for column_name, *fields
      self[column_name] = self[column_name] += mask
      save
    end
def increment_bitfields column_name, *fields
      mask = self.class.increment_mask_for column_name, *fields
      self[column_name] = self[column_name] += mask
      save
    end
Increases one or more bitfields by 1 value

 +increment_bitfield :column, :fields

 @example
   user.increment_bitfield :column, :daily, :monthly

 @param [ Symbol ] column     name of the column these fields are in
 @param [ Symbol ] field(s)   name of the field(s) to reset