PodSpecs

使用：

pod 'MTA', :podspec => 'https://raw.githubusercontent.com/dssheng/PodSpecs/master/MTA.podspec'
pod 'WeChatSDK', :podspec => 'https://raw.githubusercontent.com/dssheng/PodSpecs/master/WeChatSDK.podspec'

AliPaySDK 有bug，需要用Demo里面的lib覆盖才行