Bump toolkit to 0.10.0

This includes the bold font mixins
Implement bold font on homepage
Embiggen type on browse pages
bumping to Plek 1.0.0

Also updating all tests to use dev.gov.uk (test.gov.uk is not required)
bumping slimmer to 3.9.5
changing assets to static
Set sensible defaults if ENV vars are not found
Upgrade Rails to 3.2.11
Revert unintended changes to Gemfile.lock
Merge remote branch 'origin/bump-plek-rebased'
Remove bold from homepage strap line
Merge pull request #209 from alphagov/bold-font

Implement bold font on gov.uk homepage
Bump plek to 1.1.0.

Avoids needing to set GOVUK_APP_DOMAIN in dev mode.
Merge pull request #210 from alphagov/use_plek_1.1

Bump plek to 1.1.0.
Change homepage promo
Merge branch 'master' into travel-advice-index