Engineering Calculator provides basic engineering functions for ruby.

Gas Dynamics: include EngineeringCalculator::GasDynamics

Functions:
  fanno(m,gamma)
  isentropic(m,gamma)
  normal_shock(mx,gamma)
  prandtl_compression(mx,gamma,turning_angle)
  prandtl_expansion(mx,gamma,turning_angle)
  rayleigh(m,gamma)