Update routing to expose bazinga_jstranslation_js route

[delphiki]

This allows the bundle to be used in combination with the FOSJsRoutingBundle, and load a specific translation file via javascript / jQuery, "on demand".

Usage example:

// with jquery
$.getScript(Routing.generate('bazinga_jstranslation_js', {'domain': 'my-custom-domain'}), function(){
    alert(Translator.trans('say.hello', {}, 'my-custom-domain'));
});

I'm not sure if this has any side effect I'm not aware of, but this works pretty well.

[willdurand]

thanks