这是一个无聊的工具
给我个目录，我就能把保内的所有类爬行一遍，告诉你类之间的继承关系，然后用JSON输出出来
例如，我输入一个目录：
/Users/etiantian/flutter/flutter-0.10.0/packages/flutter/lib/
对于项目依赖的package，我可以直接指定包名
程序输出：
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viewer awesome (一个查看JSON的chrome 扩展)上查看：
AND
