Ramp:

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   Generate a ramp signal at t0 from value v0 to vF in time interval t
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   Form:
   v = Ramp( t, t0, v0, vF, vDotMax )
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   ------
   Inputs
   ------
   t           (1,:)  Time vector
   t0           (1)   Time at which to begin ramp
   v0           (1)   Initial value
   vF           (1)   Final value
   vDotMax      (1)   slope of ramp

   -------
   Outputs
   -------
   v           (1,:)  Ramp signal

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