Minor perf update
Squashed commit of the following:

commit 48f988acd728f1193b57df8cf6b0154d69c15099
Merge: 6526923 1304f27
Author: Ross Lawley <ross.lawley@gmail.com>
Date:   Thu Jul 26 08:17:45 2012 -0700

    Merge pull request #44 from faulkner/fix-notes

    Proper syntax for RST notes (so they actually render).

commit 6526923345efd768044c4fba770a8a3ada161a40
Author: Ross Lawley <ross.lawley@gmail.com>
Date:   Thu Jul 26 16:00:32 2012 +0100

    Fixed recursion loading bug in _get_changed_fields

    fixes hmarr/mongoengine#548

commit 24fd1acce68341361331e033d1692d61a936f871
Author: Ross Lawley <ross.lawley@gmail.com>
Date:   Thu Jul 26 14:14:10 2012 +0100

    Version bump

commit cbb9235dc5d863ee0bb8a315c976581e71b6a641
Merge: 6459d4c 19ec2c9
Author: Ross Lawley <ross.lawley@gmail.com>
Date:   Wed Jul 25 15:12:34 2012 +0100

    Merge branch 'master' of github.com:hmarr/mongoengine

commit 19ec2c9bc98db454680e681373f3fcd3b0f79a6c
Merge: 3070e0b 601f0eb
Author: Ross Lawley <ross.lawley@gmail.com>
Date:   Wed Jul 25 07:12:07 2012 -0700

    Merge pull request #545 from maxcountryman/patch-1

    Correcting typo in DynamicField docstring

commit 6459d4c0b60229edcd4d562898833f221d00ebf4
Author: Ross Lawley <ross.lawley@gmail.com>
Date:   Wed Jul 25 14:55:10 2012 +0100

    Fixed issue with custom queryset manager expecting explict variable names

    If using / expecting kwargs you have to call the queryset manager
    explicitly.

commit 1304f2721f7850b223950edb85ec7c141255176c
Author: Chris Faulkner <thefaulkner@gmail.com>
Date:   Tue Jul 24 14:06:43 2012 -0700

    Proper syntax for RST notes (so they actually render).

commit 598ffd3e5c107990dd41995d0bbb21bf13f67fb5
Author: Ross Lawley <ross.lawley@gmail.com>
Date:   Mon Jul 23 15:32:02 2012 +0100

    Fixed documentation

commit 601f0eb1682ebd9c9eb67f1b68b76bdd2cf3d8c7
Author: Max Countryman <maxc@me.com>
Date:   Fri Jul 20 19:12:43 2012 -0700

    Correcting typo in DynamicField docstring
Merge branch 'master' into dev
Fixes
Minor
Style changes
More updates
Added Python 3 support to MongoEngine
Merge branch 'master' into dev
Fixed image_field attributes regression
Updated travis config
Fixing build
Travis - Not sure python 3.3 support is there yet
Updated AUTHORS
Updated test for py3.2
made compatable with python 2.5
made compatable with python 2.5
Merge branch 'master' of https://github.com/LaineHerron/mongoengine

Conflicts:
	tests/test_document.py
mend
Updated changelog