EZP-23704: Added breadcrumbs in admin part

Link: https://jira.ez.no/browse/EZP-23704

## Description
Breadcrumbs for the admin pages.

![breadcrumb](https://cloud.githubusercontent.com/assets/305563/5468427/102f896a-85cf-11e4-88dc-194751c26a3e.png)


## Tests
Manual test

## Tasks

* [x] Apply on all template
* [x] Refactor pjax_admin.html.twig
* [x] CSS