Introduce ability to not sort geo queries using nearSphere (#582)

* added convenience methods and tests

* added more tests

* combined methos for sorted and unsorted queries by using `sorted` parameter

* sorted parameter defaults to true if not set

* made integration tests pending because tests again unpublished version of parse server will fail

* removed duplicate of withinGeoBox that was mistakenly added earlier

* integration tests running against latest parse-server version; re-activated integration tests for near-sphere

* reverted existing test cases to without sorted parameter; added test case with sorted=true parameter

* test against latest