Release 2.1.1

Update npmignore.

Merge pull request #72 from Polymer/release

Prepare 2.1.0 release

Prepare 2.0.1 release. (#70)

Prepare 2.0.0 release. (#64)

* Prepare 2.0.0 release.
* Make Travis generated files error more readable.
* Bump deps.

Mark NPM package private since we don't publish there yet. (#62)

Release 1.1.1

Release 1.1.0

Release 1.0.2

Prepare 1.0.1 release. (#44)