0.20
* Support for new commands:
  * Collection#find_and_modify
  * Collection#stats
  * DB#stats
* Query :fields options allows for values of 0 to exclude fields (houdini, railsjedi).
* GridFS
  * Option to delete old versions of GridFileSystem entries.
  * Filename is now optional for Grid#put.
  * Option to write arbitrary attributes to a file: @grid.put(@data, :favorite_phrase => "blimey!")
  * Indexes created on the chunks collection are now unique. If you have an existing chunks collection,
    you may want to remove 
* Removed the following deprecated items:
  * GridStore class
  * RegexpOfHolding class
  * Paired connections must now be initialized with Connection.paired

* BSON-related code extracted into two separate gems: bson and bson_ext (thx to Chuck Remes).
  * mongo_ext no longer exists.
  * BSON::Binary constructor can now take a string, which will be packed into an array.
  * Exception class adjustments:
    * Mongo::InvalidObjectID moved to BSON::InvalidObjectID
    * Mongo::InvalidDocument moved to BSON::InvalidDocument
    * Mongo::InvalidStringEncoding moved to BSON::InvalidStringEncoding
    * Mongo::InvalidName replaced by Mongo::InvalidNSName and BSON::InvalidKeyName
  * BSON types are now namespaced under the BSON module. These types include:
    * Binary
    * ObjectID
    * Code
    * DBRef
    * MinKey and MaxKey
  * Extensions compile on Rubinius (Chuck Remes).

0.19.3 2010-4-5
* Minor fix for assert_valid_keys.

0.19.2 2010-4-5
This release fixes a major bug and is the final release
in the 0.19 series. The next release, 0.20.0, will introduce
separate gems for bson and bson_ext and may require small
changes to existing code bases. Expect that release in the next
few days.
* Fix for Grid#delete bug.
* Log messages read like valid ruby driver code.
* Cursor#has_next.
* Tests for MongoDB 1.4 features.
* Flexible index creation method with Mongo::GEO2D constant.

0.19.1 2010-3-2
* Fix for HashWithIndifferentAccess in ActiveSupport-3.0

0.19 2010-3-1
* Deprecated GridFS::GridStore. Grid and GridFileSystem classes replace
the GridFS implementation with a simpler API and vastly-improved performance.
See http://www.mongodb.org/display/DOCS/GridFS+in+Ruby for more details.
* Safe mode for Grid and GridFileSystem.
* Grid and GridFileSystem use Mime/Types to detect content type (if available)
* Connection API simplified. Use Connection.paired for pairs and Connection.from_uri to
use MongoDB's connection URI specification.
* Authentication can be saved so that reauthentication happens automatically
on reconnect.
* Raise exception if authentication fails.
* Raise exception if index creation fails.
* Removed a number of deprecated methods and classes.
* Several bug fixes.
* Nearing 1.0!

0.18.3 2010-1-25
* Convert docs to YARD
* Support MongoDB extended JSON on ObjectID#to_json
* ObjectID#from_time for performing date range queries on _id (thx., Sunny Hirai)
* GridStore#mv for renaming files (Matt Powell)
* Safe mode for Collection#remove (Patrick Collison)
* Support BSON types MinKey and MaxKey
* DEPRECATED Admin, XMLToRuby, and RegexpOfHolding classes.
* Handle unsupported Numeric types gracefully (Complex, Rational, BigDecimal)
* Handle unsupported Time types gracefully (Date, DateTime, ActiveSupport::TimeWithZone)
* Numerous small bug fixes
* Minor performance improvements

0.18.2 2009-12-29
* Significant GridStore performance improvement (thx., Sunny Hirai)
* Enabled support for keyf on group
* Support :query option for Collection#distinct
* Support :finalize option for Collection#group
* (0.18.1) ObjectID#generation_time returns a created_at timestamp.
* Deprecated Command#group running as a JS eval; should now be run as a command.
* Deprecated Cursor#next_object for Cursor#next_document
* Character encoding fixes for C extension
* Enforce 4MB limit on document creation
* Simplified connection pooling code
* Fixes for connection pooling on Ruby 1.8.6/Windows.

0.18.1 2009-12-05
* Fixed issue with negative dates in Ruby 1.9
* Minor refactorings for C extension and BSON classes
* Ensure UTF-8 in Ruby 1.8
* Fix for connections on non-default port (Delano Mandelbaum)
* More explicit test suite tasks for running with/without C extension.

0.18 2009-11-25
* Connections now support connection pooling. See http://api.mongodb.org/ruby/0.18/classes/Mongo/Connection.html#M000158
* Deprecated :auto_reconnect option on connection; if the driver fails to
  connect, it will automatically try to reconnect on the subsequent operation.
  See http://www.mongodb.org/display/DOCS/Replica+Pairs+in+Ruby
* Added Collection#map_reduce helper (Christos Trochalakis)
* Deprecated DB#db_command in favor of DB#command.
* Removed deprecated old sort options, :offset, and Connection#clear.
* Lots of internal code restructuring for better maintainability.

0.17.1 2009-11-17
* Index ordering fix
* Notice to install mongo_ext

0.17 2009-11-16
* Performance improvements
  * large document inserts twice as fast as 0.16
  * queries 18% faster than 0.16 on average
  * see benchmark comparison: http://gist.github.com/236062
* Support for multi-update for Mongo >= 1.1.3 (See Collection#update)
* Collection#distinct
* Connection#copy_database (voodootikigod)
* C optimizations for ByteBuffer#to_s and ObjectID#generate (seancribbs)
* Continue code restructuring for performance and simplicity.