Merge pull request CamDavidsonPilon#77 from CamDavidsonPilon/adding-c…

…onditional-time-to

Adding conditional time to

Merge pull request CamDavidsonPilon#71 from CamDavidsonPilon/four-two

Four two

Merge pull request CamDavidsonPilon#66 from CamDavidsonPilon/version4…

…point1

v0.4.1

version 0.4, with wheel support and Cox Regression