Add prefixless versions of transitions/transforms

Future proof demo by adding standard versions of transforms/transitions. Added the required unit to the perspective value. I didn't touch the blur animation, as I couldn't see where it was being applied.

Without prefixes it still doesn’t work fully in IE as it requires preserve-3d. This is [coming soon](http://status.modern.ie/csstransformspreserve3d?term=preserv)