title: How could I query Firebase geo locations without GeoFire in order to return results based on distance between two points?
body: <p>Firebase just updated their sdk to 3.x and the current version of GeoFire 2.x doesn't work. </p>
  
  <p>What I would like to know is the best way to store geo location values so that I can query firebase so that we only return location with in a defined radius around the user. </p>
  
  <p>Example: user defines that they would like all items that are within 20 miles or less from them. </p>
  
  <p>I wonder if I could store a single value from the latitude and longitude that would allow me to quickly query for this data? Or maybe that isn't the right approach ? </p>