Add style for Form & FormItem

close #1290

components/form/Form.jsx

@@ -9,7 +9,7 @@ class Form extends React.Component {
   }
 
   render() {
-    const { prefixCls, className } = this.props;
+    const { prefixCls, className, style } = this.props;
     const formClassName = classNames({
       [`${prefixCls}-horizontal`]: this.props.horizontal,
       [`${prefixCls}-inline`]: this.props.inline,
@@ -17,7 +17,7 @@ class Form extends React.Component {
     });
 
     return (
-      <form {...this.props} className={formClassName}>
+      <form {...this.props} className={formClassName} style={style}>
         {this.props.children}
       </form>
     );

components/form/FormItem.jsx

@@ -151,6 +151,7 @@ class FormItem extends React.Component {
   renderFormItem(children) {
     const props = this.props;
     const prefixCls = props.prefixCls;
+    const style = props.style;
     const itemClassName = {
       [`${prefixCls}-item`]: true,
       [`${prefixCls}-item-with-help`]: !!this.getHelpMsg(),
@@ -158,7 +159,7 @@ class FormItem extends React.Component {
     };
 
     return (
-      <div className={classNames(itemClassName)}>
+      <div className={classNames(itemClassName)} style={style}>
         {children}
       </div>
     );