Add _prevPredictedColumns back into CLAModel.
Merge pull request #1290 from scottpurdy/hotfix

Add _prevPredictedColumns back into CLAModel.
Bug fix
Merge pull request #1295 from scottpurdy/hotfix

Bug fix
Merge pull request #1294 from rhyolight/fix-script-exit-codes-failure

Returning failure exit code for test scripts.