过滤器参数为对象属性时报错
重现 DEMO：

`template-helper.js`
```js
var runtime = require('art-template/lib/runtime');

runtime.test = function (v1, v2) {
  return v2;
}
```

`index.js`
```js
var TplA = require('tpl/a/a.tpl');

var data = { list: [{ time: 1446175992278 }, { time: 1446176021568 }] };

require('tpl/template-helpers');

$('.js-desc').html(TplA(data));
```

`a.tpl`
```html
{{each list as item}}
  <li>{{item.time | test: item.time}}</li>
{{/each}}
```

报错信息：
```
    4|         {{each list as item}}
    5|         <li><a href="http://www.qq.com">{{item.time | dateFormat:'yyyy-MM-dd hh:mm:ss'}}</a></li>
 >> 6|         <li>{{item.time | test: item.time}}</li>
    7|         {{/each}}
    8|     </ul>
    9| </div>

CompileError: Unexpected token .
   generated: $$out+=$escape($imports.test(item.time,item,.,time))
```

art-template 版本：4.11.0

环境版本：浏览器
