Change staging deploy branch to fork/format-id-guide
Change root page
Make the Format ID Guide nav item a pulldown menu
Merge branch 'develop' into fork/format-id-guide

Conflicts:
	app/views/layouts/_header.html.erb
Fix a typo
Merge branch 'develop' into fork/format-id-guide
Use retina.js
Move FIDG image content from assets/images/format_id_guide to assets/format_id_guide as rake assets:precompile doesn't seem to like subfolders of assets/images
Merge branch 'develop' into fork/format-id-guide

Conflicts:
	app/views/layouts/application.html.erb
Add landing page