AFSwiftDateExtension是iOSNSDate扩展，能使NSDate相关操作更简单，它依靠SWIFT顶层函数建立，有更好的体验和安全性。
特性：
Comparedatesusingcommoncompareoperators:>,>=,<,<=
Getintervalbetweendatesusingthatcustomoperator>-<
Add/removedatecomponentsbyusingaritmethicoperators:+,-,+=,-=
Curryedfunctions
Usesubscriptingtoaccesssingleorgroupofdatecomponents
要求：
iOS7orabove
Swift1.2
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