title: Find if given lat-long lies in any of the polygon in MongoDB
body: <p>I want to know if I get a lat-long of a user and want to check if he lies in any of the polygon that is stored in my db (MongoDB). How can this be achieved using mongoDB.
  For instance my db will have 10 polygons stored as GeoJson objects. I get a lat-long and want to check if this lat-long lies in any of the 10 polygons in my DB.
  Can this be achieved in MongoDB?</p>