fixing bug where survival_table_from_events could not deal with negative times
change the terminology in the group_ function too. Clean up the doc strings as well
another test to confirm the estimates are the same
adding setup for better autolint
survival_table now uses death times, not durations. Also linting
rebasing with master
oops
linting
Merge pull request #107 from CamDavidsonPilon/fixing-negative-times

Fixing negative times