makefile builds both models
Added utility targets, groups to makefile
chaged compiler flags, added comments'
Removed all traces of CMake
edited install and readme to reflect makefile
Link to math.h explicitly.

Without explicitly linking, the model fails to compile on Linux
machines.
updated documentation
Seperated build and link in Makefile
Merge pull request #30 from fmuzf/makefile

Replace CMake with a Makefile