index-template.html seems haven't worked correctly

I used `--seo` option to enable indexing by Google. It generates index-template.html for crawler, but its link doesn't work fine.

You can check the index page of Sencha docs.

http://docs.sencha.com/extjs/4.2.2/?_escaped_fragment_

For example, one of the links are followings.

http://docs.sencha.com/extjs/4.2.2/?_escaped_fragment_#!/api/Ext.Base

Links should use `?_escaped_fragment_=` instead of `#!`? It will work fine if that's correct.

That's why I have fixed it. Could you review this?

![index-template](https://cloud.githubusercontent.com/assets/321647/2578797/750faa22-b997-11e3-9f50-730d1c6fb2d7.png)