audit license headers
update to webcomponents.js
Removed sample/added customEffect attribute
Merge pull request #7 from Polymer/extraneous-attribute

sample -> customEffect
Ensure this.shadowRoot isn't null

There are some scenarios in which you aren't immediately providing a  `customEffect` (because it's being set dynamically later) and there are no `<core-animation-keyframe>` children, so there won't be a `shadowRoot`. This prevents `this.shadowRoot.querySelectorAll()` from throwing a runtime exception.
Merge pull request #8 from jeffposnick/patch-1

ensure this.shadowRoot isn't null
switch to new web animations polyfill
change demo style to match other core elements
fix doc typo
use web-animations-js lite polyfill
pin to web-animations-js#1.0.1
Correct repo location for web-animations
Merge pull request #14 from jobready/master

correct repo location for web-animations
Autoplay is fixed.