Merge pull request #514 from adamvi/master

Calculate Baseline referenced, SIMEX adjusted coefficient matrices and SGPs
studentGrowthPercentiles.R
Merge branch 'master' of https://github.com/CenterForAssessment/SGP
Merge pull request #515 from adamvi/master

 Clean up use of sim.iters when B and # of matrices differ.
Update of studentGrowthPercentiles .simex.sgp and AR SGPstateData
Refinement of simex.sgp
Update to simex.sgp
Bug fixes in latest simex additions
Merge pull request #516 from dbetebenner/master

Updates and bug fixes to baseline simex sgp work and adding AR data to SGPstateData
Merge pull request #517 from adamvi/master

Move assignment of calculate.simex.baseline
Adding simex.sample.size to simex
Merge branch 'master' of https://github.com/CenterForAssessment/SGP
Bug fix from previous commit
Bug fixes and implementation of simex.sample.size
Adding fault tolerance associated with NULL data.tables being passed to student growth projections
Merge pull request #518 from dbetebenner/master

Refinements and fault tolerance for simex.sgp