fix(warning): Fix the React Warning about CSS property (#84)
fix(warning): Fix the React Warning about CSS property (#84)

Since React@15.0.0, React warns us about the CSS unitless string value
such as `margin: "0"`.
storybooks/react-storybook,shilman/storybook,storybooks/storybook,bigassdragon/storybook,storybooks/react-storybook,storybooks/storybook,storybooks/react-storybook,rhalff/storybook,storybooks/storybook,shilman/storybook,nfl/react-storybook,rhalff/storybook,enjoylife/storybook,nfl/react-storybook,rhalff/storybook,enjoylife/storybook,storybooks/storybook,enjoylife/storybook,storybooks/storybook,jribeiro/storybook,storybooks/storybook,rhalff/storybook,nfl/react-storybook,bigassdragon/storybook,kadirahq/react-storybook,jribeiro/storybook,kadirahq/react-storybook,shilman/storybook,storybooks/react-storybook,bigassdragon/storybook,rhalff/storybook,bigassdragon/storybook,enjoylife/storybook,shilman/storybook,storybooks/storybook,nfl/react-storybook,jribeiro/storybook,jribeiro/storybook,rhalff/storybook