Update govuk_admin_template to 1.1.2

* Update jQuery to 1.11.1
* Update Bootstrap to 3.2
* Also update formtastic from rc3
Fix clipping on ‘compare to master’ icon
Fix rendering of 'edit notes' modal

* Add Bootstrap 3 form classes to text area to stop it from riding into
the footer
* Remove the fade animation
* Add the modal-title class to the h3 title to fix margins
Merge pull request #69 from alphagov/update-admin-gem

Update govuk_admin_template to 1.1.2