Bump .ruby-version to 2.1.2
Merge pull request #324 from alphagov/upgrade-ruby-to-2.1.2

Bump .ruby-version to 2.1.2
Only show the percentage of unresolved mappings when some exist

- Use an instance variable defined in the controller instead of data
  access in the views - pointed out by @jamiecobbett.
- Indent inside the `if` statement.
Merge pull request #329 from alphagov/only_show_percentage_when_unresolved_mappings_exist

Only show the percentage of unresolved mappings when some exist