created classes and constructors

1. slope.models
    a. normal_mixture
    b. glg
2. Acute Model
3. ResidualParameters
removed hazard parameters
Documentation updates
Removed unneeded changes
finished fixing to build.
classes combined.
tests failing.
added testing for slope model.constructors
documentation update.
update constructor in glg.
AcuteModel testing stub
collapsed PatientInfo
updated with lots of todo tags for jenny to review.
results and bug fixes from discussion in person
added validity checks to the slope model classes
Updated tests and classes to match.
I added some test functions and fixed some bugs.-Jian
test
fixed a bug, added some test functions
fixed FindTrtSlope
fixed FindTrtEGFR, added a test function
Reclassify hazards & revised slope.model