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   Compute the viscosity of the air at a given temperature.
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   Form:
   v = AirViscosity( T );
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   ------
   Inputs
   ------
   T             (1)     Temperature        [deg Celsius]

   -------
   Outputs
   -------
   v             (1)     Viscosiity         [m^2/s]

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   Reference:  http://users.wpi.edu/~ierardi/PDF/air_nu_plot.PDF 
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   Copyright 2003 Princeton Satellite Systems, Inc.
   All rights reserved.
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