去掉form添加校验hook的限制，以及一点小修改

docs/style.md

@@ -239,6 +239,9 @@ amis 集成了 [fontawesome](http://fontawesome.io/icons/)，所以关于图标
 .text-u-c { text-transform: uppercase; }
 .text-l-t { text-decoration: line-through; }
 .text-u-l { text-decoration: underline; }
+.text-left { text-align: left; }
+.text-center { text-align: center; }
+.text-right { text-align: right; }
 ```
 
 

src/renderers/Form/Control.tsx

@@ -309,7 +309,7 @@ export default class FormControl extends React.PureComponent<
       control = control.getWrappedInstance();
     }
 
-    if (control && control.validate && this.model) {
+    if (control && control.validate) {
       const formItem = this.model as IFormItemStore;
       let validate = promisify(control.validate.bind(control));
       this.hook = function() {

src/renderers/Table.tsx

@@ -94,6 +94,8 @@ export interface TableProps extends RendererProps {
   buildItemProps?: (item: any, index: number) => any;
   checkOnItemClick?: boolean;
   hideCheckToggler?: boolean;
+  rowClassName?: string;
+  rowClassNameExpr?: string;
 }
 
 export default class Table extends React.Component<TableProps, object> {
@@ -125,7 +127,9 @@ export default class Table extends React.Component<TableProps, object> {
     'combineNum',
     'items',
     'valueField',
-    'saveImmediately'
+    'saveImmediately',
+    'rowClassName',
+    'rowClassNameExpr'
   ];
   static defaultProps: Partial<TableProps> = {
     className: '',