A python REPL task.
Review Request #563 — Created June 18, 2014 and submitted
Also, changes to scala REPL to match functionality. Also, integration tests for both. Pushed as 5019e219ed146a1fb3afc91a8e9fb351a5b61115.
All tests run. CI baking. I notice that running all integration tests on my laptop is far slower than running each individually. Not sure why.