Make tests runnable from lifelines.tests
Make tests runnable from lifelines.tests

This commit allows the following syntax:

    python -m lifelines.tests

Which can come in handy for refactoring tests into several
test-suites.

Signed-off-by: Jonas Kalderstam <35a2c6fae61f8077aab61faa4019722abf05093c@kalderstam.se>

jstoxrocky/lifelines,CamDavidsonPilon/lifelines,nerdless/lifelines,wavelets/lifelines