Test animateTransform transforms

From the specification http://www.w3.org/TR/SVG/animate.html#AnimateTransformElement
  For a type="translate", each individual value is expressed as <tx> [,<ty>].
  For a type="scale", each individual value is expressed as <sx> [,<sy>].
  For a type="rotate", each individual value is expressed as <rotate-angle> [<cx> <cy>].
  For a type="skewX" and type="skewY", each individual value is expressed as <skew-angle>.

<rotate-angle> <cx> <cy> is not currently supported by the Web Animations polyfill.
Merge pull request #38 from ewilligers/test-animateTransform

Test animateTransform transforms