CSHARP-980:fixed issue with Kerberos corrupting managed memory.
CSHARP-993: Ensure unique ObjectIds across AppDomains.
CSHARP-986: Allow $external as a database name even though it contains a "$".
CSHARP-987: fixed issue with bulk upsert identifiers on pre-2.6 servers.
CSHARP-987: Code review changes.
CSHARP-995: Add support for reading the new extended JSON formats added in server 2.6.
added failing maxscan test.
CSHARP-1000: $maxscan should be spelled as $maxScan

SetMaxScan method added $maxscan option instead of $maxScan option which resulted in that option being ignored by mongod.
CSHARP-1001: Fix certain output formats of JsonWriter.
CSHARP-1005: Fix ReadPreference to provide correct GetHashCode() values.
added missing 1.9.2 release notes file.
code review changes.
updated release notes for 1.9.2.
Bumping version post release.
CSHARP-990: added SCRAM-SHA-1 support.