Require rouge 1.3.3.
Merge pull request #1452 from isbadawi/upgrade-rouge

Upgrade rouge to 1.3.3
Make sidebar stretch to bottom and only put margins on main content wrapper
Remove unnecessary classes because styles aren't being used
Merge pull request #1453 from jessabean/fix_layout_styles

Fix layout styles
Fix broken link to exercise readme. Fixes #1454
Fix malformed URLs in hibernation email
Merge branch 'pull-1455'
Add more seed data for x-api
Add a very basic structure for the redesign
Pencil in help page in redesign
Add placeholders in redesign
Add a scrollbar to sidebar when there are lots of notifications
Fix the floating delete notifications link
Merge pull request #1456 from jessabean/sidebar_overflow

Sidebar overflow
Refactor to use settings.development?
Merge pull request #1460 from michaelavila/use_settings_development

Refactor to use settings.development?
Add instructions for installing and using HLint
Merge pull request #1462 from soapie/master

Add instructions for installing and using HLint
Upgrade puma