1.[!] Unable to find a specification for 'XXXXX..'
解决办法：
pod repo remove master
pod setup
pod install
参考文章
http://my.oschina.net/ioslighter/blog/379165
http://stackoverflow.com/questions/25913733/unable-to-find-a-specification-in-cocoapods
http://blog.csdn.net/zhangao0086/article/details/39703083
2.pod setup 慢
参考文章
http://www.jianshu.com/p/43a268ba8f47
http://swiftcn.io/topics/29
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3.更新cocoapod
sudo gem install -n /usr/local/bin cocoapods -v1.6.1
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