Create authentication-with-java-driver.txt

Just starting it off.  Don't pull yet...
Update source/tutorial/authentication-with-java-driver.txt

Added description of existing authentication using the new MongoClient API
Update source/tutorial/authentication-with-java-driver.txt

Added Kerberos section
Update source/tutorial/authentication-with-java-driver.txt

Updated some property values.  Set codeblock lexer.
merge: java auth documentation
java authentication docs
added .NET docs for authentication via the 1.8 driver.
edits to java authentication tutorial
minor: note about linux-only testing
Minor correction
merge: authentication for dotnet
edits: authentication with csharp driver
merge: correction
minor: title correction