Add rotateConstant, scaleConstant, translateConstant

[xaviervia]

https://twitter.com/joaomilho/status/896044982263566337

Not a fan of Constant as suffix but it communicates the idea well.

[xaviervia]

I feel like the answer to this is not going to come from React Dream, but rather from lada

[xaviervia]

Probably we need to move all this extra helpers to a separate package.