Add method to see if user has any expiring or expired certificates
Add warning message if user has expiring or expired certificates
Change aasm_state to state

This allows a expired, or expiring state to be set
Get days to expiry for expiring certificates
Add translations
Add status badges for expiring or expired certificates
Add expiry date to notice

Fixes https://github.com/theodi/shared/issues/247
NESTING STUFF IN THE H1 MAKES EVERYTHING A BIT SHOUTY
Merge pull request #793 from theodi/feature-show-expiring-status-on-list

Show certificate's expiring status on 'My Certificates' page