Removing old weighted.median function in favor of weightedMedian from matrixStats package
Adding SCALE_SCORE_PRIOR test to testSGP(1)
Merge pull request #673 from dbetebenner/master

Adding SCALE_SCORE_PRIOR to testSGP(1)
Add ability to use unique school names for WA (future school assignments)
Merge branch 'master' of github.com:CenterForAssessment/SGP