Your Podfile has had smart quotes sanitised. To avoid issues in the future, you should not use TextEdit for editing it. If you are not using TextEdit, you should turn off smart quotes in your editor of choice.
我这里改用了xcode编译podfile
屏幕快照 2016-07-18 下午1.38.09.png
参考：http://www.cocoachina.com/ios/20150410/11526.html
参考：http://blog.csdn.net/appxcode/article/details/51178487
