Add refleak hunting for individual test files (runtests.py not supported yet)
Refactor numba.testing to rely on NumbaTestProgram
Make numba.testing executable with "python -m"
Update travis configuration to have the same output as before
Tweak the leak detection algorithm a bit
Merge branch 'master' of github.com:numba/numba into refleak_testing
Merge pull request #607 from pitrou/refleak_testing

Add refleak hunting