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.
I added this to `make test`. It will fail now, I have fixes on 
https://github.com/johnjbarton/compat-table.git branch traceur-0-50 .