Changes in version 0.0.0.9000                      

  - Starts from fork of icenReg (v2.0.16)
  - Implements strata for semi-parametric fits in C++
  - Remove code to focus on ic_sp() fitting
  - Add profile likelihood variance calculation for coefficients
  - Re-implement R code for model fitting and class implementation (S3
    vs reference classes)
  - Implement logrank type tests
  - Add tests
  - Fixes to C++ for edge cases and numerical stability
  - Some performance optimisations