Add govuk_frontend_toolkit (v0.9.0) as a dependency

We'll be using this to provide typographic consistency with other
gov.uk projects.
Show the in-page search form

For users who have JavaScript enabled we'll be providing an in-page
search. Add the HTML for the time being to show what it's likely to
look like.
Add list and label fixes for IE6/7

Essentially they don't think about margins and lists in the same way
so we need to make adjustments in both cases.
Add Gemfury repository