Removed a couple of MongoRequestMessage TODOs
 fixed a bug due to improper ordering of instanceof conditionals.  Since CodeWScope extends Code, it has to be checked before Code
Using ObjectId constructor instead of massageToObjectId factory method
 Reading and writing binary representation of ObjectId now just uses byte arrays produced and consumed by ObjectId class
JAVA-609, JAVA-586, JAVA-749: Major changes to ObjectId class.  The major change is that ObjectId now conforms to the spec.  Instead of representing as 3 4-byte value, it now properly uses a 4-byte timestamp, 3-byte machine identifier, 2-byte process identifier, and 3-byte counter.

The logic for generating machine identifier has changed.  Since we are java 6 minimum now, using NetworkInterface.getHardwareAddress() for more uniqueness.

The logic for generating process identifier has changed.  It attempts to get the actual numeric process id from JMX, falling back to a string hash only if if it can't.  It looks for a pattern in the process name of <process_id>@<host_name>.  No longer using the classloader hash either, since each class loader will have a separate instance of NEXT_COUNTER, which is seeded with a random number and so is very unlikely to clash.

Removed a bunch of stuff

 Removed support for 'babble' format.
 Removed constructors that didn't conform to the spec (machine identifier only, instead of machine identifer and process identifier)
 Removed support for isNew/notNew.  I don't see a need for this.  It was only used in save method, and it seems the only purpose is to decide whether to do an insert of an upsert.  I don't see any harm in always doing an upsert.  This also has
 the nice property of making ObjectId immutable.
 Removed a bunch of poorly named methods: _flip(int), _inc(), _machine(), _time()
 Removed massageToObjectId(java.lang.Object)' factory method

 Other non-backwards compatible changes:

  equals method will no longer compare equal to anything but an ObjectId

 Additionally, added getters that conform to the spec: timestamp, machineIdentifier, processIdentifier, and counter.  Deprecated the old ones.