rebase

components/table/index.jsx

@@ -262,6 +262,7 @@ var AntTable = React.createClass({
 
   renderColumnsDropdown(columns) {
     return columns.map((column) => {
+      column = objectAssign({}, column);
       let key = this.getColumnKey(column);
       let filterDropdown, menus, sortButton;
       if (column.filters && column.filters.length > 0) {
@@ -295,14 +296,8 @@ var AntTable = React.createClass({
           </span>
         </div>;
       }
-      let originTitle;
-      if (Array.isArray(column.title)) {
-        originTitle = column.title[0];
-      } else {
-        originTitle = column.title;
-      }
       column.title = [
-        originTitle,
+        column.title,
         sortButton,
         filterDropdown
       ];