css property unit issue with react 15.1.0
I got lots of warnings such as:

 `Warning: a`div`tag (owner:`Saturation`) was passed a numeric string value for CSS property`top`(value:`0`) which will be treated as a unitless number in a future version of React.`

They are also from 'chrome, hue, alpha, and checkboard'. I use version 2.1.0 of react-color. Any fix yet?
