changed the simex function so that we can use 'variable' instead of 'state'
no longer require panel.data.vnames to be able to use variable in simex calculation in studentGrowthPercentiles
add an option to use loss.hoss from 'variable' as well as 'state'
add an option to use loss.hoss from 'variable' as well as 'state'
remove key from parallelization of .simex.sgp
revised simex code
removed fitted.b to reduce memory consumption
removed fitted.b to reduce memory consumption
merge with upstream
removed extra studentGrowthPercentiles backups
bug fix for simex.sgp
bug fix for simex.sgp
Merge pull request #450 from shangyi/master

revised studentGrowthPercentiles