Generate a gallery of animation comparions

[ewilligers]

We show the SVG animation on the left and the equivalent animation using Web Animations on the right.

At the bottom of the page, we show the source code for each animation.

The gallery generated by this change can be visited at http://svg-animation-gallery.appspot.com/static/generate-gallery/svg-animation/examples/index.html

[alancutter]

There's probably no need for an Appengine page, you can just use rawgit: https://rawgit.com/ewilligers/svg-animation/generate-gallery/examples/index.html

[alancutter]

The difference between pages is quite trivial, it's probably simpler to use one page with a bit of Javascript instead of generating all these pages from templates.

[ericwilligers]

use one page with a bit of Javascript instead of generating all these pages

Done

[alancutter]

lgtm