Inductor:

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   Dynamical model for an inductor model. 

   Finds current derivative from inductance and voltage.

   v = l di/dt

   Returns di/dt or the state space matrices [a, b, c, d]

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   Form:
   [a, b, c, d] = Inductor( l )

   or

   iDot         = Inductor( g, v )

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   ------
   Inputs
   ------
   g          (1,1)  Data structure
                     .l        (1,1) Inductance
   v          (1,1)  Voltage

   -------
   Outputs
   -------
   iDot or a  (1,1)  Current derivative or state matrix
   b          (1,1)  Input matrix
   c          (1,1)  Output matrix
   d          (1,1)  Feedthrough matrix

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