Compile kangax's es6 tests and verify the compat-table entries.

The compat-table data-es6.js file builds the web page showing compatiblity results.
Reading that file and extracting the tests allows tracuer results to be verified.
This API is confusing. What else does parse contain?

For now you can do:

```js
var {tree} = compiler.stringToTree({content: src});
```