Merge pull request #674 from adamvi/master

Update combineSGP and studentGrowthPlot_Styles for WA
Updating SGPstateData
Merge pull request #675 from dbetebenner/master

Updating SGPstateData
Add sgPlot.reports.group.vars argument to visualizeSGP
Merge branch 'master' of github.com:CenterForAssessment/SGP