Vactrak additions, few fixes, cleanup

- Added .fa-large css for larger icons
- Allow adding/removing tracked users from the vac-tram-list
- Largeify the icons on the vactrak homepage
- Removed note about broken .append on VacList
- Added /api/track/<id> route for tracking (other route is deprecated,
will shortly be removed)
- Added /api/info/tracked route for seeing who the current user tracks