added a flag -e to keep files backed up that exist on the server
added a flag -e to keep files backed up that exist on the server

tamsky/tablesnap,juiceblender/tablesnap,juiceblender/tablesnap,russss/tablesnap,betable/tablesnap,JeremyGrosser/tablesnap,ethanmiller/tablesnap,heroku/tablesnap,betable/tablesnap,russss/tablesnap,JeremyGrosser/tablesnap