CSHARP-797: Change unit tests affected by server version 2.6.0-rc2.
CSHARP-941: Change default GridFS chunk size from 256KiB to 255KiB.
CSHARP-942: Throw a NotSupportedException if the Exhaust query flag is used.
Change all versions numbers in the code to production version numbers. Also, standardize on 3-component version numbers.
CSHARP-943: Split large batches correctly when InsertBatch is being emulated using write commands.
CSHARP-943: Added more unit tests.
removed pre-release note in release notes.