update grammar and adsl and generate parser and generate new ast model
skulpt.py to 2.7
updates ast.js to 2.7.6
All tests pass. 1st dictionary comprehension!!
adds set comprehensions

output is different because the set doesn’t get all shook up in skulpt.
Make google closure compiler happy
Adds set literals
Adds debugger statement.
Dry up compgens
Call with null to make goog happy
Rebase on master
Fix last failing tests and make closure happy.
adds tests back in
regen run tests with 2.7
Merge branch 'update-grammar-to-2.7.6' of github.com:albertjan/skulpt into albertjan-update-grammar-to-2.7.6
Merge branch 'albertjan-update-grammar-to-2.7.6'