Added link to Collections list. Added links on list and link to old A-Z page.
Changed to sets_path and link_to helpers.
Merge branch 'master' into feature/CollectionsList
Merge pull request #233 from OregonDigital/feature/CollectionsList

Feature/collections list
Allowed for the possibility of mismatched facets for the same PID.
Merge pull request #238 from OregonDigital/feature/FixCollectionFacet

Allowed for the possibility of mismatched facets for the same PID.
Merge branch 'master' into feature/Copyright