Set checked additionalCategories to be highlighted
Decouple the scroll event from a POI being highlighted
Highlight POIs as they are selected for detail

 - Added a convenience function for removingHighlighting from other
   poi's in the collection
Update styling for highlighting and distance

 - Definitely not a final styling for distance but a start, would rather
   not use float
Merge pull request #15 from ox-it/styling-amenities

Styling amenities