WAR conversion

Bryan Crosnick calculated the exact way in which we'd put each version of WAR (fWAR, rWAR and WARP) on the same scale. These all use different replacement levels so thanks to his work we can now compare these players using the same replacement level.

2012 fWAR to rWAR Conversion: -0.00094 fWAR/PA

2012 WARP to rWAR Conversion: 0.00046 WARP/PA