integrating preproc into standard loader
Merge pull request #241 from rwhaling/master

integrating preproc into standard loader
Revert "integrating preproc into standard loader"
Merge pull request #242 from ARTFL-Project/revert-241-master

Revert "integrating preproc into standard loader"
merge downstream changes
Merge pull request #52 from ARTFL-Project/master

update downstream