Using html ajax request instead of json to update tree

[tdesvenain]

Now collective.navigationtoggle can't be adapted to specific portlet navigation customizations because of the pure javascript tree update implementation.

I suggest that the tree is updated by a html view (the response is generated by a view with html template)

I can do the implementation as I need this on a project.

[keul]

To be honest the original idea behind this package is exactly this: try to copy the navigation format from the client side HTML, not calling the server.
Obviously this implementation can't be fefect.

However an (optional) alternative implementation can be a good idea (like: looking for an adapter/view, and use it if found).

If you want to provide this feature: you are welcome!

[tdesvenain]

Ok i'll make a pull request, but i'll need to change the javascript in order to get html, not json