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   Converts R and V to Equinoctial elements
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   Form:
   eq = RV2Eq( r, v, mu )
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   ------
   Inputs
   ------
   r               (3,1) Position vector
   v               (3,1) Velocity vector
   mu                    Gravitational constant

   -------
   Outputs
   -------
   eq                    Elements vector [a,P1,P2,Q1,Q2,l]

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	  References:	  Bate, R.R., et. al. Fundamentals of Astrodynamics, pp. 70-71.
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