Import gfortran-4.8.2 as lang/gfortran.

gFortran compiler from the GNU Compiler Collection (GCC) 4.8 branch.
gFrotran supports Fortran 95/2003/2008 standards.
Added lang/gfortran version 4.8.2
Add gfortran
Add compiler support code for lang/gfortran Fortan 95/2003/2008 compiler
from GCC.