Demo to show how to use dispatch_group
###运行环境
- Xcode: 7.3.1
该Demo主要是演示dispatch_group的使用方法，通过dispatch_group的方法，将网络请求的2张图片，在全部请求完成时再拼装成一张图片展示。
说明dispatch_group_enter和dispatch_group_leave的使用场景
###相关文章 iOS 多线程GCD之dispatch_group
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Demo to show how to use dispatch_group
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HustHank/DispatchGroupDemo
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