15分钟掌握iOS9 3D Touch的Quick Actions
苹果在iOS 9中引入的 3D touch功能，相关的API分为3个部分：
- Quick actions
- Peek and Pop
- Pressure Sensitivity。
具体参见：http://mp.weixin.qq.com/s?__biz=MjM5NDMzMTcxMg==&mid=212175593&idx=1&sn=887118aaa63d4d364ccf16be9e807a72#rd
https://developer.apple.com/library/prerelease/ios/documentation/UserExperience/Conceptual/Adopting3DTouchOniPhone/index.html#//apple_ref/doc/uid/TP40016543-CH1-SW1
https://developer.apple.com/library/prerelease/ios/documentation/General/Reference/InfoPlistKeyReference/Articles/iPhoneOSKeys.html#//apple_ref/doc/uid/TP40009252-SW36
https://developer.apple.com/library/prerelease/ios/samplecode/ApplicationShortcuts/Introduction/Intro.html#//apple_ref/doc/uid/TP40016545-Intro-DontLinkElementID_2
https://github.com/DeskConnect/SBShortcutMenuSimulator
http://www.stringcode.co.uk/add-ios-9s-quick-actions-shortcut-support-in-15-minutes-right-now/