Merge pull request #443 from dbetebenner/master

Bug fix in boundary level substitution in SGP and fan chart updates
Merge pull request #444 from dbetebenner/master

More CSEM confidence interval refinements
Merge pull request #445 from dbetebenner/master

Updates to get all the different confidence interval types to play well together in summarizeSGP
Merge branch 'master' of https://github.com/CenterForAssessment/SGP