Story 53500391:  Adjusted position of extended div to align with currenly hovered sidebar item
Story 53500391: Made fade-out/fade-in delays 300ms and covered all cases of mouse move
Story 53513741: Updated count in references/people list when adding or deleting same from selector
Merge pull request #94 from reciprocity/feature/side_nav_refinements

Sidebar "extended" popover-ish improvements