Update doc/tools.rst

Added mongobox to the list of Framework Tools.
Minor formatting fix.
Give a hint to old versions of 2to3.
Skip SSL tests on broken old python 3 versions.
Fix in_request() for multiple threads with MongoReplicaSetClient and MasterSlaveConnection  PYTHON-428
Update MasterSlaveConnection for the Connection->MongoClient rename
If the env var HA_TOOLS_DEBUG is defined, print some debug info from ha_tools.py
Better docstring for assertReadFrom test utility function
Fix use_greenlets property for MongoClient and MongoReplicaSetClient
Clarified docstring for MongoReplicaSetClient use_greenlets argument
Fix test_use_greenlets in test_replica_set_connection for installs w/o gevent
Fix indentation in TestConnection.test_contextlib
Minor docstring improvements
Add validate_positive_integer_or_none() function for Motor
Make AutoReference.__database public so Motor can access it
Motor's hooks into PyMongo
Pass use_greenlets as a kwarg to Pool, for Motor's sake
Remove TEXT constant PYTHON-456

The "text search" feature is experimental in
MongoDB 2.4 and the index type may change.
Allow RO admin and RW non-admin users concurrently PYTHON-458
Fix minor typo.