Update govuk_admin_template to 1.1.2

* Update jQuery to 1.11.1
* Update Bootstrap to 3.2
Add link-open hook to API user table filter

When filtering the table, if a user hits ‘Enter’ it will open the first
link marked with a `js-open-on-submit` class
Merge pull request #264 from alphagov/update-admin-gem

Update govuk_admin_template to 1.1.2
Pre-empt GMail auto-linking GOV.UK

GMail is being helpful by converting GOV.UK
to a link, but it should link to www.gov.uk
instead.
Merge pull request #265 from alphagov/prepempt-google-linking-GOV.UK

Pre-empt GMail auto-linking GOV.UK
Reduce Signon Administrator privileges

Initial attempt (test fixes still to come) to simplify and restrict what user's are able to do on Signon.

 * 'Filter by Role' shows roles that are appropriate for the current user
 * Only be able to administer users lower in the permission hierarchy
 * Restrict the abilities of Admin and Organisation Admin users
 * Can only grant users permissions for apps that the admin user can access.