- Capitalization fix - -DLINUX not being picked up, -D__linux__ is; changing
- Capitalization fix
- -DLINUX not being picked up, -D__linux__ is; changing

Compiling on Linux mostly working; must manually copy libChronoEngine.so 
and libChronoEngine_MPI.so to bin/Linux64_gcc to finish. Issue appears 
to be with the CH_LIBDIR in CMakeLists.txt


Bryan-Peterson/chrono,andrewseidl/chrono,amelmquist/chrono,Milad-Rakhsha/chrono,dariomangoni/chrono,jcmadsen/chrono,Milad-Rakhsha/chrono,Bryan-Peterson/chrono,dariomangoni/chrono,armanpazouki/chrono,jcmadsen/chrono,PedroTrujilloV/chrono,hsu/chrono,rserban/chrono,PedroTrujilloV/chrono,dariomangoni/chrono,hsu/chrono,andrewseidl/chrono,andrewseidl/chrono,PedroTrujilloV/chrono,PedroTrujilloV/chrono,PedroTrujilloV/chrono,jcmadsen/chrono,tjolsen/chrono,projectchrono/chrono,dariomangoni/chrono,Bryan-Peterson/chrono,armanpazouki/chrono,amelmquist/chrono,jcmadsen/chrono,scpeters/chrono,Bryan-Peterson/chrono,amelmquist/chrono,tjolsen/chrono,projectchrono/chrono,scpeters/chrono,jcmadsen/chrono,armanpazouki/chrono,Milad-Rakhsha/chrono,jcmadsen/chrono,armanpazouki/chrono,rserban/chrono,projectchrono/chrono,armanpazouki/chrono,amelmquist/chrono,dariomangoni/chrono,rserban/chrono,andrewseidl/chrono,jcmadsen/chrono,Milad-Rakhsha/chrono,dariomangoni/chrono,projectchrono/chrono,amelmquist/chrono,projectchrono/chrono,Bryan-Peterson/chrono,tjolsen/chrono,hsu/chrono,hsu/chrono,scpeters/chrono,tjolsen/chrono,amelmquist/chrono,armanpazouki/chrono,scpeters/chrono,rserban/chrono,tjolsen/chrono,projectchrono/chrono,rserban/chrono,rserban/chrono,Milad-Rakhsha/chrono,rserban/chrono,andrewseidl/chrono,Milad-Rakhsha/chrono,hsu/chrono,scpeters/chrono