Array.from polyfill: Only use Function#call when thisArg is provided.

This was much slower than it needs to be for the common case, when `thisArg` isn't provided.
Switch to use import * as for code

This removes the support for the old syntax

Fixes #1119
0.0.55
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
0.0.56
set empty source root for browser compilation