v0.1.1  --  2014.10.07
* Fix isImplemented, so it returns true in case of polyfill
* Improve documentations

v0.1.0  --  2014.04.28
* Assure strictly npm dependencies
* Update to use latest versions of dependencies
* Fix implementation detection so it doesn't crash on `String(symbol)`
* throw on `new Symbol()` (as decided by TC39)

v0.0.0  --  2013.11.15
* Initial (dev) version