Fitting Running Speed into xOBA and xBABIP.

A general introduction to the methods I use to incorporate running speed.  The system remains almost entirely intact, but I have since added a few small corrections here and there to fix small problems.  I'm not happy with this system, and I would love to get rid of it, but I haven't found a better solution.  Which is a low bar, since I don't feel this solution is very good.