Remove/Replace nav tags
Bump slimmer to 3.17.0

To enable us to fix the breadcrumb markup
Merge pull request #34 from alphagov/bump_slimmer

Bump slimmer to 3.17.0
Return 503 on content API timeout.
Merge pull request #35 from alphagov/503_on_api_timeout

Return 503 on content API timeout.
Add Travis config.
Merge pull request #31 from alphagov/fix-nav-usage

Quick accessibility fixes - BLOCKED UNTIL SLIMMER UPDATES
Merge conflict with nav updates