Station tracking works when app is active
-local notification shows alert when current/ideal destination stations open or fill up
-map annotations update on 1-min refreshes with new dock count and red color shifts to new current destination station if needed
-same annotationIdentifier used for every annotation; annotation type is defined by which object is being displayed as an annotation instead of the identifier property
-fix for bike crosshair image reappearing too soon after cancel button is pressed
-label is updated with new bike destination when needed