Lifelines

New features
- New `predict_hazard` for parametric regression models.
- New lymph node cancer dataset, originally from *H.F. for the German Breast Cancer Study Group (GBSG) (1994)*

Bug fixes
- fixes error thrown when converge of regression models fails.
- `kwargs` is now used in `plot_covariate_groups`
- fixed bug where large exponential numbers in `print_summary` were not being suppressed correctly.

- Bug fix for PyPI

New features
- `StatisticalResult.print_summary` supports html output.

Bug fixes
- fix import in `printer.py`
- fix html printing with Univariate models.

New features
- new `lifelines.plotting.rmst_plot` for pretty figures of survival curves and RMSTs.
- new variance calculations for `lifelines.utils.resticted_mean_survival_time`
- performance improvements on regression models' preprocessing. Should make datasets with
high number of columns more performant.

Bug fixes
- fixed `print_summary` for AAF class.
- fixed repr for `sklearn_adapter` classes.
- fixed `conditional_after` in Cox model with strata was used.

New features
- new `print_summary` option `style` to print HTML, LaTeX or ASCII output
- performance improvements for `CoxPHFitter` - up to 30% performance improvements for some datasets.

Bug fixes
- fixed bug where computed statistics were not being shown in `print_summary` for HTML output.
- fixed bug where "None" was displayed in models' `__repr__`
- fixed bug in `StatisticalResult.print_summary`
- fixed bug when using `print_summary` with left censored models.
- lots of minor bug fixes.

New features
- new `print_summary` abstraction that allows HTML printing in Jupyter notebooks!
- silenced some warnings.

Bug fixes
- The "comparison" value of some parametric univariate models wasn't standard, so the null hypothesis p-value may have been wrong. This is now fixed.
- fixed a NaN error in confidence intervals for KaplanMeierFitter

API Changes

- To align values across models, the column names for the confidence intervals in parametric univariate models `summary` have changed.
- Fixed typo in `ParametricUnivariateFitter` name.
- `median_` has been removed in favour of `median_survival_time_`.
- `left_censorship` in `fit` has been removed in favour of `fit_left_censoring`.