MAJOR REFACTORING

* Refactored PatientInfo
* Refactored SimulateCKD
* Updated All tests
* Added MortalityModel
* Refactored SlopeModel(s)
        - renamed from slope.model to SlopeModels
        - removed deprecated functions
        - added glgRegression
* Separated Classes into different files
* added TimeModel
Merge branch 'master' of 155.100.191.128:/home/aredd/projects/university/CKDsim

Conflicts:
	R/CKD_simulation_main.R
	R/simulate.R
	inst/tests/test-class-SimulationParameters.R
	inst/tests/test-simulate.R
merged unresolved conflict.
Adding examples/options.R