add fluid support to navbar on bootstrap3
Ability to disable add/remove buttons

I had to disable "add" or "remove" buttons, to I tried this configuration:

    ->add('items', 'collection', array(
        'allow_add' => true,
        'widget_add_btn' => null,
    ));

but the button still appeared.

With this modification, add_button and remove_button are disablable
Bootstrap-sass is available in packagist.org

The full url: https://packagist.org/packages/twbs/bootstrap-sass
Using twbs/bootstrap-sass

Using twbs/bootstrap-sass v3.1.1
Merge pull request #853 from qckanemoto/navbar-container-fluid

add fluid support to navbar on bootstrap3
Merge pull request #856 from anacona16/patch-1

Bootstrap-sass is available in packagist.org
Merge pull request #857 from anacona16/patch-2

Using twbs/bootstrap-sass
Merge pull request #854 from AppVentus/master

Ability to disable add/remove buttons
Update base_initializr.html.twig

I propose this small change to improve even more this wonderful bundle.

My reasons were:

* Needed a specific version of jquery
* Needed to set up a different place for local copy of jquery
* Didn't want to override the whole foot_script block
* Thought that this blocks add more development flexibility
Merge pull request #860 from davidvartanian/patch-1

Update base_initializr.html.twig