Created propMotor.m to find equilibrium shaft Ω

Creates surface fit of Cp as a function of omega and V and uses this to
find propeller torque, and along with motor torque propeller
equilibrium rotation rate.
Created file to hold motor coefficients

Excel file with motor names and motor coefficients
Created motorParse.m to parse motor data file.
Changed plotEfficiency domain to kRPM and airspeed
Created function to plot propeller torque.

Plots propeller torque as a function of airspeed and rotation rate.
Changed output prop diameter units to meters.