Only show the ten most popular tags on the site dashboard
Merge pull request #373 from alphagov/site_dashboard_show_ten_most_popular_tags

Only show the ten most popular tags on the site dashboard
Update db/structure.sql to new format

As of Rails 4.0, db:structure:dump now uses mysqldump rather than a
custom format:

    https://github.com/rails/rails/commit/ccc6910cb034efc6b749e1ae82c748085a671fa9

It now includes a lot more detail - this commit doesn't include any
actual schema changes.
Merge pull request #375 from alphagov/update_structure_format

Update db/structure.sql to new format
Clarify a Cucumber step that creates tags
Merge pull request #374 from alphagov/clarify_tags_step

Clarify a Cucumber step that creates tags