Add History.md

Author: dstoc

History.md

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+### 1.0.0 — *November 21 2014*
+
+  The web-animations-js hackers are pleased to announce the release of
+  a new codebase for the Web Animations Polyfill:
+  https://github.com/web-animations/web-animations-js
+
+  The previous polyfill has been moved to:
+  https://github.com/web-animations/web-animations-js-legacy
+
+  The new codebase is focused on code-size -- our smallest target is
+  now only 33kb or 11kb after gzip.
+
+  We've implemented native fallback. If the target browser provides
+  Web Animations features natively, the Polyfill will use them.
+
+  We now provide three different build targets:
+
+  `web-animations.min.js` - Tracks the Web Animations features that
+  are supported natively in browsers. Today that means Element.animate
+  and Playback Control in Chrome. If you’re not sure what features you
+  will need, start with this.
+
+  `web-animations-next.min.js` - All of web-animations.min.js plus
+  features that are still undergoing discussion or have yet to be
+  implemented natively.
+
+  `web-animations-next-lite.min.js` - A cut down version of
+  web-animations-next, removes several lesser used property handlers
+  and some of the larger and less used features such as matrix
+  interpolation/decomposition.
+
+  Not all features of the previous polyfill have been ported to the
+  new codebase; most notably mutation of Animations and Groups and
+  Additive Animations are not yet supported. These features are still
+  important and will be implemented in the coming weeks.