Upgrade to Ruby 2.1.2
Install launch to support `save_and_open_page` in cucumber.
Add Subcategory#combined_title.

Provides context for short topic titles like
"Wells" in "Oil and Gas: Wells".
Expose Subcategory#slug.
Bump the govuk_frontend_toolkit to 1.7.0
Bump the gds-api-adapters to 15.0.0
Alphabetise Sass imports.
Allow signup to email alerts for topics.
Merge pull request #47 from alphagov/allow-signup-to-email-alerts-for-topics

Allow signup to email alerts for topics