Use mongodb with extra null checks.
Commit mongo npm-shrinkwrap.json change.
Update docs and examples to the RC.
Add History entry for 0.6.4.1.
Use a commit of node-mongo-native with a unique package.json version.

Avoids confusing the npm cache.
Update docs and examples to rc3.
Update banner and notices to 0.6.4.1
Update docs and examples to 0.6.4.1
Merge branch 'release-0.6.4.1'
Merge remote-tracking branch 'upstream/master'