Fix some style

components/radio/group.jsx

 import React from 'react';
+import classNames from 'classnames';
 
 function getCheckedValue(children) {
   let value = null;
@@ -17,7 +18,6 @@ export default React.createClass({
     return {
       prefixCls: 'ant-radio-group',
       disabled: false,
-      size: 'default',
       onChange() {
       },
     };
@@ -77,10 +77,10 @@ export default React.createClass({
       }
       return radio;
     });
-    return (
-      <div className={`${props.prefixCls} ${props.prefixCls}-${props.size}`}>
-        {children}
-      </div>
-    );
+    const classString = classNames({
+      [props.prefixCls]: true,
+      [`${props.prefixCls}-${props.size}`]: props.size,
+    });
+    return <div className={classString}>{children}</div>;
   },
 });

style/components/inputNumber.less

@@ -110,7 +110,6 @@
     input {
       height: 32px;
       line-height: 32px;
-      font-size: 14px;
     }
 
     .@{input-number-prefix-cls}-handler-up-inner {