Fix Crash while loading.

Fix  https://github.com/xhzengAIB/MessageDisplayKit/issues/44
Fix Code Style.
Add voice icon button to search bar.

fix  https://github.com/xhzengAIB/MessageDisplayKit/issues/102
Fix code style.
Fix code style.
Fix send the short text message bug.

fix  https://github.com/xhzengAIB/MessageDisplayKit/issues/110
Fix the code style.
setup the scanning tip logic.

fix  https://github.com/xhzengAIB/MessageDisplayKit/issues/108
Update README.md
Add badge view.

fix  https://github.com/xhzengAIB/MessageDisplayKit/issues/106
Merge pull request #8 from xhzengAIB/master

update code