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   Generates a Wing. The tail points in the z direction.
   You enter the leading and trailing edge locations as a 
   function of z.
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   Form:
   [v, f] = Wing( xLE, xTE, z, lERatio, taper )
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   Inputs
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   xLE        (1,:) Leading edge position
   xTE        (1,:) Trailing edge position
   z          (1,:) Spanwise position
   lERatio    (1,1) Leading edge x to y ratio
   taper      (1,1) Ratio of root to tip

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   Outputs
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   v          (:,3)  Vertices
   f          (:,3)  Faces

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