Fix disabled props in RadioGroup, closes #603

components/radio/demo/radiobutton.md

@@ -19,7 +19,7 @@ ReactDOM.render(<div>
   <div>
     <RadioGroup onChange={onChange} defaultValue="a">
       <RadioButton value="a">杭州</RadioButton>
-      <RadioButton value="b">上海</RadioButton>
+      <RadioButton value="b" disabled>上海</RadioButton>
       <RadioButton value="c">北京</RadioButton>
       <RadioButton value="d">成都</RadioButton>
     </RadioGroup>

components/radio/group.jsx

@@ -42,7 +42,7 @@ export default React.createClass({
           {...radio.props}
           onChange={this.onRadioChange}
           checked={this.state.value === radio.props.value}
-          disabled={this.props.disabled}
+          disabled={radio.props.disabled || this.props.disabled}
         />;
       }
       return radio;