Initialized the project
Viscous correction: Change \chi(p) -> \chi(p/T) to be consistent with the new notation.
Change the viscous rates to be consistent with prefactor, \pi^{\mu\nu} q_\mu q_\nu, which is calculated in global lab frame.
add GNUmakefile
Merge branch 'master' of https://github.com/chunshen1987/viscous_emissionrate_tables_HG_2to2_with_chemical_potential_and_Formfactor