Report options errors in REPL UI

Fixes #1229

Review URL: https://api.github.com/repos/google/traceur-compiler/issues/1230

Closes #1230, closes #1229.
Repl: Fix issue where location  was not updated.

This was a regression from 75ca1e0b25027bb152b96245a899bd7d4b57178a

Fixes #1234
Make sure async-functions work without generators.

This was due to a typo.

Fixes #1231
Commit binaries for 0.0.55