got warnings while upgraded to react v15.0 rc
react added a helpful warning in v15.0 rc-1:

> React DOM: When specifying a unit-less CSS value as a string, a future version will not add px automatically. This version now warns in this case (ex: writing style={{width: '300'}}. (Unitless number values like width: 300 are unchanged.)

warnings like these:

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

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