Adjust welsh heading size
Adjust welsh on mobile
Merge pull request #395 from moneyadviceservice/fixes_to_welsh

Fixes to welsh trust banner heading on the homepage
Add method to return list of parent Categories an Article resides in
Add Page Object support for new category navigation
Add helper method to return all categories in the repository
Show new primary navigation for articles

Feature covers an article belonging in a single child category, within a
single parent category
Cover scenario of article existing in 2 categories within the same parent category
Cover scenario with an article residing in 2 categories within different parent categories
Use the decorated article
Create concern to handle setting active category
Use Navigation concern to specify currently active categories

The partial doesn't need to know about the current article now