Generate AST classes based on spec

[mvcisback]

Generate the all classes in the AST based on: https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey/Parser_API

[mvcisback]

Currentl plan:

• Parse the linked html page using pyquery for pre tags
• In the pre tags, find interfaces, enums, and what not and generate python classes
• Use those python classes to interpret spidermonkey AST's

[mvcisback]

Closed by #12