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.
Server 2.6 getCmdLineOpts reports --nojournal differently.

Conflicts:
	src/MongoDB.Driver.Tests/Operations/BulkWriteOperationTests.cs
CSHARP-1057: Fix unit test.

Conflicts:
	src/MongoDB.Driver.Tests/Operations/BulkWriteOperationTests.cs