Add tags to auto-complete search
Add tags to auto-complete search

refs #5845
- display matched tags in auto-complete dropdown, load tag edit screen when selected
- fix bug where only 1 search item with the same ID would be displayed (eg. if a post and tag both had an ID of 1 it would only show the first-loaded item)

TryGhost/Ghost,TryGhost/Ghost,TryGhost/Ghost