富文本显示展开和收起的demo

用YYLabel做的富文本，详见demo

Name		Name	Last commit message	Last commit date
Latest commit History 3 Commits
Pods		Pods
YYLabelDemo.xcodeproj		YYLabelDemo.xcodeproj
YYLabelDemo.xcworkspace		YYLabelDemo.xcworkspace
YYLabelDemo		YYLabelDemo
.gitignore		.gitignore
LICENSE		LICENSE
Podfile		Podfile
Podfile.lock		Podfile.lock
README.md		README.md

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