turn on Travis CI

Signed-off-by: Daniel Halperin <dhalperi@cs.washington.edu>
travis ci: fix test script

Signed-off-by: Daniel Halperin <dhalperi@cs.washington.edu>
query_tests: remove old import

Broke Travis; locally, I had a cached .pyc but it was deleted a long
time ago.

Signed-off-by: Daniel Halperin <dhalperi@cs.washington.edu>