Added method to add multiple locations to GeoFire at once
Renamed `batchSet()` as `set()`
Removed unnecessary empty check
Added more verification for `set()`
Merge pull request #56 from firebase/jw-batch-set

Added method to add multiple locations to GeoFire at once
Fixed typo in README (batchSet() -> set())
Cleaned up changelog text
[firebase-release] Updated GeoFire to 3.2.0
[firebase-release] Removed changelog and distribution files after releasing GeoFire 3.2.0
Update to v3.2.0