Merge pull request #119 from yourtion/master

Fix pod error AudioToolbox
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
fix the XHRefreshControl style.
Add net work core

fix  https://github.com/xhzengAIB/MessageDisplayKit/issues/115
Fix the error for default values.
fix the emotions local path bug.
fix the XHRefreshControl bug.
Add the Pop Menu api to use.
Refactor api.
fix bug for gif error.
fix code style.
Fix the refreshCircleView two mode bug.
Update pod spec file to v0.2.2, fix the pop menu row height bug.
Update MessageDisplayKit.podspec file
Update MessageDisplayKit.podspec v0.2.2 file
Update README.md