[WIP][RFC] add FOSJsRoutingBundle

refs #1552

ping @cmfcmf @Guite

I am pretty sure this is correct, but I have yet to figure out to make it work in my own javascript file. I know that it is trying to work, but failing.

for example

`var route = Routing.generate('zikulaextensionlibrarymodule_ajax_setversionstatus', null, true);`

returns: `Error: The route "zikulaextensionlibrarymodule_ajax_setversionstatus" does not exist.`

so, I need some ideas.
@cmfcmf I'm quite sure this line is incorrect. I was trying to implement the [instructions](https://github.com/FriendsOfSymfony/FOSJsRoutingBundle/blob/master/Resources/doc/index.md#usage) 
> Add these two lines in your layout:
```
<script src="{{ asset('bundles/fosjsrouting/js/router.js') }}"></script>
<script src="{{ path('fos_js_routing_js', {"callback": "fos.Router.setData"}) }}"></script>
```
but the second is not a path to a script, but I'm not exactly sure what it is :smile: 

the answer is probably in [this area of the docs](https://github.com/FriendsOfSymfony/FOSJsRoutingBundle/blob/master/Resources/doc/index.md#commands) and maybe needs to 'compile' a new js file and then include it (maybe using assetic?) if it sounds like i have no clue what I'm talking about ... you're right! :squirrel: