Crimes Are Now Markers

Crime data has now successfully been converted to use markers. Now I
need to update the refreshCrime function to work in kind. Also, the
rectangle selection cursor seems to work just fine now.
Crimes Update Properly Now

Our new crime markers are now not only created properly, but updated
properly too. Also, fixed an issue in the refreshCrimeData function that
was calling a nonexistent function, "getById", so I replaced the
function "getId" with "getById". The rectangle cursor continues to
behave as expected. Of course, area selection still suffers and
definitely can't make sense of multiple boxes.