Add -nc to wget to avoid it "not clobber" (or download a *.1 version of it) the file if it already exists.
remove old downloads of scala*tgz before downlaoding and untar-ing a new version.
Merge pull request #226 from andyk/master

Add -nc to wget to avoid it "not clobber" (or download a *.n version of) the file if it already exists.