minor fixes for merchandising components
added data-link-name
Add a Try around unsafe operation
only replace placeholder if ad successful
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
Add helper class for figuring out whether a link is external
Add fallback for external urls breaking
Add CSS class to cards that are external links
Add Sponsorships Without Sponsors to Email Alert
Make 'external' a tone, not modifier class
Remove Email Debug Switch
Properly sort by descending time
Add a 12-story slice to the fast container definition
Merge pull request #7240 from guardian/placholder-text

Only replace placeholder if ad successful
Add ten best photographs of day
clickMacro added
Fix ordering test
Add thrasher container