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
Simplify parsing of for loops

This also enforces that for-in does not have an initializer.
implement Array.of
remove source root for filename

Currently, this implementation is causing the path to double up - `some/file/url.js` becomes `some/file/url.js/some/file/url.js`.

The source root is optional, and only necessary if there are a number of source files that would benefit from having a common root.

Review URL: https://api.github.com/repos/google/traceur-compiler/issues/1226

Closes #1226.
Include README in npm package
Log value of a superClass when it's invalid

Specially useful as a better error message when the superClass is undefined

In docs, rename UniqueIdGenerator to UniqueIdentifierGenerator
Use template literals when logging an invalid superClass
Add to and export PlaceholderParser

- Makes the error reporting of PlaceholderParser more informative.
- Adds parseModule and parseScript template tags.
- Exports parseModule, parseScript, parseExpression, and parseStatement from
  the main Traceur module, as properties of the codegeneration export.
ensure traceur System is exported not the global
Exponentiation expression should be right associative

Fixes #1245
Destructuring does not require an object any more
0.0.57
Remove runtime remove assertObject

This could not be included in the last commit due to self hostin
issues. It required a npm push before it was safe to remove.
Correct sourceMaps option in test and verify it.

Partly fixes #1254

Review URL: https://api.github.com/repos/google/traceur-compiler/issues/1258

Closes #1258, closes #1254.