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
adding kmf tests against R
cleaning up some dead code + adding __all__
cleaning up some lint errors
Make lifelines work in pure python mode

Added a pure python version of concordance index,
as a fallback option, for developers without access
to a proper compiler (Windows people). This allows for
easier contribution to the library, while still allowing
us to maintain the higher speed for users who install from
pypi.

The setup script will now try to compile the extensions, and if
it fails, it will do it again with just the python source.

Signed-off-by: Jonas Kalderstam <jonas@kalderstam.se>
Added test for python version of cindex

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