OSD release 0.2 intro post

For the release 0.2, I choose to work on the flow issue in debugger.html link. It is for maintaining the core health of the project. By adding "// @flow" to src/workers/parser/types.js, flow will check the JavaScript code for errors automatically. Check here for more information on Flow.

First, it introduces 28 errors:

I found there is a easy error to fix so I reduced it to 27. I am going to do my best and fix the rest of issues.

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