Removed error testing of collection.rename, as this was really a test of the server, and the server behavior has changed for 2.6

Conflicts:
	src/test/com/mongodb/DBTests.java
Skipping authentication tests for server 2.5 and up, since this branch does not support the new user CRUD commands that are going to be required in 2.6
One more auth test to skip for 2.5 and up.
JAVA-1070: Restricted NULL Unicode character checks to cstring, so that a normal value string can contain one
JAVA-1071: authenticate no longer fails if there is no primary
Preparing for 2.11.4 release
Preparing for next snapshot