You're going to have to wrap the footer container between these:
<div role="navigation">
<div class="container">
<!-- your footer -->
</div>
</div>
You may have to further edit the classes, but by default, this should work.
EDITED: having another look at your code i see that the container you use for your footer is within another container. I suggest you either take it out of that container or simply apply width:100%
to both containers (in line or in your custom css). Make sure you remove any side margins.