Updated propulsion parasite drag

Fineness ratio for a supersonic fuselage has been changed to use full
length due to the relatively short cabin length of these aircraft.
Fixed variable mismatch
Now respects user-specified mac
Fixed for new variable convention
Fixed to correct unstable results. Still needs tweaking.
Merge branch 'master' of https://github.com/suavecode/SUAVE

Conflicts:
	trunk/SUAVE/Methods/Flight_Dynamics/Static_Stability/Approximations/Tube_Wing/taw_cmalpha.py
adjusted for new variable convention
fixed problem with sweep management
Commented out a debug line
Commented out a debug line
fixes for dynamic_pressure_ratio
Merge branch 'master' into feature-gasturbine

Conflicts:
	scripts/regression/test_mission_B737.py
incorporating parasite drag and stability model changes