Fill in gem details
Use rails engine
Pass bootstrap mixins and styles through

* By including govuk_admin_template in application.js the bootstrap
javascript is passed through
* By including govuk_admin_template in application.scss the bootstrap
styles and mixins are passed through
Add IE javascript shims for HTML5 and bootstrap 3

* Precompile scripts
* Create basic layout with conditional IE scripts and non-javascript
helper class
Yield app content

* Use standard head, content and page_title yields as used in
govuk_template
Port admin styles from Transition

* Use a default inverted header with a GOV.UK logo
* Override bootstrap 3 buttons with bootstrap 2 styles
* Include theme variables such as default vertical margin, visited link
colours and button colours
* Includes various CSS helper classes
Include yields for navigation and footer version

* Allow main navigation links using navbar_items, which expects a list
of <li>s
* Allow logged in as text, etc in top right using navbar_right
* Include a version number in the footer when provided