improved download script
improved download script

+ show progress bar
+ interrupt/resume the download correctly
+ able to resume download

erossignon/node-occ,OpenWebCAD/node-occ,erossignon/node-occ,OpenWebCAD/node-occ,erossignon/node-occ,OpenWebCAD/node-occ,OpenWebCAD/node-occ,OpenWebCAD/node-occ,erossignon/node-occ,erossignon/node-occ