GET: /api/ninjas?lng=12.32&lat=9.23
POST: /api/ninjas
{ "name":"N3", "available":false, "rank":"black belt", "geometry":{ "type":"Point", "coordinates":[132.50,21.56] } }
PUT: /api/ninjas/5b13c2696fa8ad0d9af88ed9
{ "geometry":{ "type":"Point", "coordinates":[112.50,12.56] } }
DELETE: /api/ninjas/5b1192c3a02e100ee0e15db3