one detail about the update of the static content

This is just a detail, but in the integration page http://django-angular.readthedocs.org/en/latest/integration.html we speak about : 

```html
<script src="{{ STATIC_URL }}djangular/js/django-angular.min.js" type="text/javascript"></script>
```
without recalling to the reader how to not forget to add the javascript file to the static content.

If you think it should be part of the good practice to any django dev and it should not be forgotten by anyone - drop this PR ;)