better readme and improved svn folder verification.

Author: borissov

README.md

@@ -1,2 +1,4 @@
-<b>nerdtree-svn-plugin</b><br/>
+# nerdtree-svn-plugin
 A plugin of NERDTree to show "commit" and "update" SVN commands in directory menu.
+## demo 
+![NERDTree SVN Demo](https://raw.githubusercontent.com/borissov/nerdtree-svn-plugin/master/images/image_1.png)

images/image_1.png

@@ -7,7 +7,13 @@ let g:loaded_nerdtree_svn_menuitem = 1
 
 function! NERDTreeSvnDirectoryCheck()
     let curNode = g:NERDTreeFileNode.GetSelected()
-    return curNode.path.isDirectory
+    if curNode.path.isDirectory
+        let output = system("svn info ".curNode.path.str() . g:NERDTreePath.Slash())
+        if output !~ "E155007"
+            return 1
+        endif
+    endif
+    return 0
 endfunction