Update tools documentation (mongodb#345)

Add testing driver, mongomock.
Add new ORM-like framework, uMongo.
Update no longer maintained ORM-like libraries, MongoKit, MongoAlchemy, 
minimongo, and Manga.

Author: Defrank

doc/tools.rst

@@ -48,11 +48,6 @@ Humongolus
    `at github <https://github.com/entone/Humongolus>`_. Tutorials and usage
    examples are also available at GitHub.
 
-MongoKit
-  The `MongoKit <http://github.com/namlook/mongokit>`_ framework
-  is an ORM-like layer on top of PyMongo. There is also a MongoKit
-  `google group <http://groups.google.com/group/mongokit>`_.
-
 Ming
   `Ming <http://merciless.sourceforge.net/>`_ (the Merciless) is a
   library that allows you to enforce schemas on a MongoDB database in
@@ -62,12 +57,6 @@ Ming
   <http://blog.pythonisito.com/2009/12/ming-01-released-python-library-for.html>`_
   for more details.
 
-MongoAlchemy
-  `MongoAlchemy <http://mongoalchemy.org>`_ is another ORM-like layer on top of
-  PyMongo. Its API is inspired by `SQLAlchemy <http://sqlalchemy.org>`_. The
-  code is available `on github <http://github.com/jeffjenkins/MongoAlchemy>`_;
-  for more information, see `the tutorial <http://mongoalchemy.org/tutorial.html>`_.
-
 MongoEngine
   `MongoEngine <http://mongoengine.org/>`_ is another ORM-like
   layer on top of PyMongo. It allows you to define schemas for
@@ -76,6 +65,35 @@ MongoEngine
   <http://github.com/mongoengine/mongoengine>`_; for more information, see
   the `tutorial <http://docs.mongoengine.org/en/latest/tutorial.html>`_.
 
+MotorEngine
+  `MotorEngine <https://motorengine.readthedocs.io/>`_ is a port of
+  MongoEngine to Motor, for asynchronous access with Tornado.
+  It implements the same modeling APIs to be data-portable, meaning that a
+  model defined in MongoEngine can be read in MotorEngine. The source is
+  `available on github <http://github.com/heynemann/motorengine>`_.
+
+uMongo
+  `uMongo <https://umongo.readthedocs.io/>`_ is a Python MongoDB ODM.
+  Its inception comes from two needs: the lack of async ODM and the
+  difficulty to do document (un)serialization with existing ODMs.
+  Works with multiple drivers: PyMongo, TxMongo, motor_asyncio, and
+  mongomock.  The source `is on github
+  <https://github.com/Scille/umongo>`_
+
+No longer maintained
+""""""""""""""""""""
+
+MongoKit
+  The `MongoKit <http://github.com/namlook/mongokit>`_ framework
+  is an ORM-like layer on top of PyMongo. There is also a MongoKit
+  `google group <http://groups.google.com/group/mongokit>`_.
+
+MongoAlchemy
+  `MongoAlchemy <http://mongoalchemy.org>`_ is another ORM-like layer on top of
+  PyMongo. Its API is inspired by `SQLAlchemy <http://sqlalchemy.org>`_. The
+  code is available `on github <http://github.com/jeffjenkins/MongoAlchemy>`_;
+  for more information, see `the tutorial <http://mongoalchemy.org/tutorial.html>`_.
+
 Minimongo
   `minimongo <http://pypi.python.org/pypi/minimongo>`_ is a lightweight,
   pythonic interface to MongoDB.  It retains pymongo's query and update API,
@@ -90,13 +108,6 @@ Manga
   Django ORM, but Pymongo's query language is maintained. The source `is on
   github <http://github.com/wladston/manga>`_.
 
-MotorEngine
-  `MotorEngine <https://motorengine.readthedocs.io/>`_ is a port of
-  MongoEngine to Motor, for asynchronous access with Tornado.
-  It implements the same modeling APIs to be data-portable, meaning that a
-  model defined in MongoEngine can be read in MotorEngine. The source is
-  `available on github <http://github.com/heynemann/motorengine>`_.
-
 Framework Tools
 ---------------
 This section lists tools and adapters that have been designed to work with
@@ -153,3 +164,6 @@ These are alternatives to PyMongo.
   MongoDB driver for Python Tornado applications.
 * `TxMongo <https://github.com/twisted/txmongo>`_ is an asynchronous Twisted
   Python driver for MongoDB.
+* `MongoMock <https://github.com/mongomock/mongomock>`_ is a small
+  library to help testing Python code that interacts with MongoDB via
+  Pymongo.