Add common animatable svgs

http://www.google.com/design/spec/animation/delightful-details.html#delightful-details-delightful-details

A few icons have transitions that are so common as to be ubiquitous, especially the menu/arrow transition. It would be nice if the animations were released under the same license as the core icons. Can this be included in your icon set?

Start by reviewing the linked Material Design animation specification and compare its menu/arrow transition with the existing icon set. No repository files or tests are named, so first locate how icons and licensing are organized; done means the requested common animated SVGs are included under the core icons' license.

Written by the indexing model from the issue text.