Force slow containers for certain tag types
Fix visual bug in fast containers on tag pages
Merge branch 'master' into pretty-tag-pages

Conflicts:
	common/app/layout/Front.scala
Properly sort by descending time
Add a 12-story slice to the fast container definition
Add ten best photographs of day
Fix ordering test
Merge pull request #7242 from guardian/pretty-tag-pages

Prettify tag pages