树形结构，模板递归

ng-include 巨坑啊：ng-include=" ' abc.html ' " 或是script模板的id，但是要有单引号啊！！！！！！！

http://jsfiddle.net/brendanowen/uXbn6/8/

<script type="text/ng-template" id="tree_item_renderer.html">

{{data.name}}

<button ng-click="add(data)">Add node</button>

<button ng-click="delete(data)" ng-show="data.nodes.length > 0">Delete nodes</button>

<ul>

    <li ng-repeat="data in data.nodes" ng-include="'tree_item_renderer.html'"></li>

</ul>

<ul ng-app="Application" ng-controller="TreeController">

<li ng-repeat="data in tree" ng-include="'tree_item_renderer.html'"></li>

</ul>