GeoQuery is only returning nearby keys if a huge radius is set

### DESCRIPTION
This issue is similar to the ticket [https://github.com/firebase/geofire-js/issues/80](url) .

GeoQuery returning near by records from firebase geofire directory after setting the radius of a large area.

### Version info
**Firebase:**
"^4.3.0"

**GeoFire:**
"^4.1.2"
**Other (e.g. Node, browser, operating system) (if applicable):**
Mac / Chrome
npm 5.2.0

### Test case
GeoQuery must return all records within the radius specified.

### Steps to reproduce
Set smaller radius with records in firebase and the Geoquery returns no records unless we set a wider range to the radius parameter.

### Expected behaviour
GeoQuery must return all records within the radius specified.

### Actual behaviour
I have 3 records within few meters but GeoQuery returns nearby records only when a wider range of radius say in kilometres is set.

### CIRCLE RADIUS to 300 METRES

### After setting GeoQuery RADIUS to 1

### After setting GeoQuery RADIUS to 6

Start by reproducing the GeoQuery radius behavior described for GeoFire 4.1.2 and Firebase 4.3.0, comparing a radius of 1 with a radius of 6. The payload names no source file or test, so trace the GeoQuery implementation and add a regression test covering records within the specified radius; done means all nearby records are returned at the smaller radius.

Written by the indexing model from the issue text.