Revert "replaced read.csv with fread to improve speed"
Revert "replaced read.csv with fread to improve speed"

This reverts commit c55be36a2efd67f980534333ef8eb716dae1c4ac.

agapow/smartr,thehyve/heim-SmartR,agapow/smartr,agapow/smartr,thehyve/heim-SmartR,thehyve/heim-SmartR,agapow/smartr,thehyve/heim-SmartR