Fix more bug and add workspace more projects

fix https://github.com/xhzengAIB/MessageDisplayKit/issues/23

fix https://github.com/xhzengAIB/MessageDisplayKit/issues/22

fix https://github.com/xhzengAIB/MessageDisplayKit/issues/21

fix https://github.com/xhzengAIB/MessageDisplayKit/issues/20