Update a docstring.
MOTOR-40 asyncio tests should choose the longer of the two possible timeouts.

This diverges from Tornado's gen_test decorator, but it's the right behavior.
MOTOR-40 Catch wrong uses of asyncio_test decorator.
MOTOR-40 Rename test to TestAsyncIODatabase.
MOTOR-40 Test Motor with asyncio and callbacks.
Arrange imports in test_motor_grid_file.
Whitespace in motor_gridfs.py.
MOTOR-40 Simpler setup for AsyncIOTestCase.
MOTOR-40 Finish making GridFS framework-agnostic.
MOTOR-40 Fix some copyright dates.
MOTOR-40 Test AsyncIOMotorClient with IPv6.
MOTOR-40 A few tests of AsyncIOMotorReplicaSetClient.
More useful instructions for testing Motor with SSL.
Pass the IOLoop explicitly in SSL tests.
Fix Motor's hostname-validation tests, which weren't running.
MOTOR-40 Simpler hostname resolution for Tornado framework.