LVStageTimes:

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   Compute the launch vehicle staging times from the model and coast times.
   Since version 2015.1
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   Form:
   [t0,tF] = LVStageTimes( lvModel, coastTimes )
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   Inputs
   ------
   lvModel      (.)     Launch vehicle data structure
   coastTimes  (1,n)    Coast times       

   -------
   Outputs
   -------
   t0          (1,n)     Stage start times
   tF          (1,n)     Stage end times

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