add call ring
no message
Merge branch 'develop' of https://github.com/easemob/sdkexamples-ios into develop

# By dujiepeng
# Via dujiepeng
* 'develop' of https://github.com/easemob/sdkexamples-ios:
  update:更新chatList头像设置
  remove sdwebimage.framework
  update:sdwebimage
  update:行高
  update:添加设置行间距

Conflicts:
	ChatDemo-UI2.0/ChatDemo-UI2.0.xcodeproj/project.pbxproj