Release 1.1.X features compatibility for MongoDB 2.2 as well as a slew of
bug fixes and improvements.

- Added Mongos connection type with a fallback list for mongos proxies,
supports ha (on by default) and will attempt to reconnect to failed proxies.
- Documents can now have a toBSON method that lets the user control the
serialization behavior for documents being saved.
- Gridstore instance object now works as a readstream or writestream
(thanks to code from Aaron heckmann (
https://github.com/aheckmann/gridfs-stream)).
- Fix gridfs readstream (Issue #607, https://github.com/tedeh).
- Added disableDriverBSONSizeCheck property to Server.js for people who
wish to push the inserts to the limit (Issue #609).
- Fixed bug where collection.group keyf given as Code is processed as a
regular object (Issue #608, https://github.com/rrusso2007).
- Case mismatch between driver's ObjectID and mongo's ObjectId, allow both
(Issue #618).
- Cleanup map reduce (Issue #614, https://github.com/aheckmann).
- Add proper error handling to gridfs (Issue #615,
https://github.com/aheckmann).
- Ensure cursor is using same connection for all operations to avoid
potential jump of servers when using replicasets.
- Date identification handled correctly in bson js parser when running in
vm context.
- Documentation updates
- GridStore filename not set on read (Issue #621)
- Optimizations on the C++ bson parser to fix a potential memory leak and
avoid non-needed calls
- Added support for awaitdata for tailable cursors (Issue #624)
- Implementing read preference setting at collection and cursor level
   * collection.find().setReadPreference(Server.SECONDARY_PREFERRED)
   * db.collection("some", {readPreference:Server.SECONDARY})
- Replicaset now returns when the master is discovered on db.open and lets
the rest of the connections happen asynchronous.
  - ReplSet/ReplSetServers emits "fullsetup" when all servers have been
connected to
- Prevent callback from executing more than once in getMore function (Issue
#631, https://github.com/shankar0306)
- Corrupt bson messages now errors out to all callbacks and closes up
connections correctly, Issue #634
- Replica set member status update when primary changes bug (Issue #635,
https://github.com/alinsilvian)
- Fixed auth to work better when multiple connections are involved.
- Default connection pool size increased to 5 connections.
- Fixes for the ReadStream class to work properly with 0.8 of Node.js
- Added explain function support to aggregation helper
- Added socketTimeoutMS and connectTimeoutMS to socket options for
repl_set.js and server.js
- Fixed addUser to correctly handle changes in 2.2 for getLastError
authentication required
- Added index to gridstore chunks on file_id (Issue #649,
https://github.com/jacobbubu)
- Fixed Always emit db events (Issue #657)
- Close event not correctly resets DB openCalled variable to allow reconnect
- Added open event on connection established for replicaset, mongos and
server
- Much faster BSON C++ parser thanks to Lucasfilm Singapore.
- Refactoring of replicaset connection logic to simplify the code.
- Add `options.connectArbiter` to decide connect arbiters or not (Issue
#675)
- Minor optimization for findAndModify when not using j,w or fsync for safe