Some CGAL fixes
Fixed CGAL collision detection if segment-triangle-intersection result is a segment and not a point.
Added example include and lib paths to Makefile for manually compiled CGAL library.
Commented out usually unneeded Makefile variables
changes in makefile
Makefile matches upstream
new Makefile produced errors so using Makefile prior to changes
commiting in file
Improved description on how to manually include CGAL library.
Fixed search path options

Empty search path options broke some versions of gcc.
new Makefile from upstream