Upgrade admin gem to 1.1.6

* Upgrade gem to 1.1.6 [Changelog](https://github.com/alphagov/govuk_admin_template/blob/master/CHANGELOG.md)
  * Fixes asset pipeline for Rails 4 apps — crown icon will display on preview/production now
  * Upgrade Bootstrap to 3.2
  * Upgrade jQuery to 1.11.1
* Tweak display of new request and dashboard

![screen shot 2014-10-24 at 15 54 40](https://cloud.githubusercontent.com/assets/319055/4771317/b9fe5f8c-5b8d-11e4-858b-e62ea364cd97.png)
![screen shot 2014-10-24 at 15 54 46](https://cloud.githubusercontent.com/assets/319055/4771318/ba12bfa4-5b8d-11e4-940e-cdeafd056835.png)