Fix broken MotorCursorTest.test_to_list_tailable.
Avoid running helper method test_resolver() as a unit test.
Merge remote-tracking branch 'origin/master'

# By Corey Farwell
# Via A. Jesse Jiryu Davis (1) and Corey Farwell (1)
* origin/master:
  Enable automated testing on Python 3.4
Finish Motor 0.3 changelog.
(cherry picked from commit 3065336)
Update Travis config for Tornado 4b1.
Explain why we have a "sleep" in .travis.yml.