Merge branch 'master' into develop
Case 2609 - Fixed markup for search results.
Merge branch 'case-2609' into develop

* case-2609:
  Case 2609 - Fixed markup for search results.
case 1712 - Certain ting settings fields requirement disabled. Sanity checks for empty fields.
Case 2616 - Added ISBN to entity.
Case 2616 - Code review.
Merge branch 'case-2616' into develop

* case-2616:
  Case 2616 - Code review.
  Case 2616 - Added ISBN to entity.
Stop spamming the dblog, please.
case 2478 - Custom ranking available in dropdown, when custom ranking is chosen and at least one ranking field is defined.
Merge branch 'case-1712' into develop
Case 2607 - Added hooks.
Merge branch 'case-2478-ting' into develop
Case 2607 - Code review.
Merge branch 'case-2607' into develop

* case-2607:
  Case 2607 - Code review.
  Case 2607 - Added hooks.
Merge remote-tracking branch 'origin/develop'