CDRIVER-2161 sphinx 1.6 compatibility
CDRIVER-2161 sphinx 1.6 compatibility

ajdavis/libbson,mapr/libbson,mongodb/libbson,rcsanchez97/libbson,mapr/libbson,mapr/libbson,ajdavis/libbson,mongodb/libbson,rcsanchez97/libbson,mongodb/libbson,rcsanchez97/libbson,ajdavis/libbson