Bump govuk template to 0.9.1
Bump govuk frontend toolkit to 2.0.1
Update govuk elements Sass files to latest version

Add helper mixins for new grid layout
Update govuk elements example pages

- Use proportional heading classes
- Use new grid layout
- Simplify grid wrapper on form example page
Add a content area the default page example
Import and explain govuk_elements

- Import elements at the top of application.scss
- Explain how styles for #content, #content h1 and .alpha-banner exist
within elements and where to find those
- Add a comment about how to continue in the easiest way possible - to
continue adding Sass at the bottom of application.scss, or to modify
govuk elements, or to re-arrange and those files as makes most sense to
the person using the prototype kit.
- This way, anyone copying and pasting snippets from govuk elements
into the prototype kit, will see that code just work. Which is a good
place to start.
Add javascript polyfills

- Details polyfill for details/summary
- Modernizr for detect touch events for date entry
Update form example page to use new javascript

- Show detail/summary working as “Help with date of birth”
- Show date picker working with touch detected for mobile
Merge pull request #31 from gemmaleigh/an-opinionated-default

Update govuk elements and demonstrate use