implement is_duplicate function, to check for duplicates using md5sums.
treebcdbbf51bac46f950a3cbfcacf2e8bea417ca57c
-rw-r--r-- 80 .gitignore
-rw-r--r-- 5949 Build.PL
-rw-r--r-- 352 Changes
-rw-r--r-- 840 MANIFEST.SKIP
drwxr-xr-x - bin
drwxr-xr-x - lib
drwxr-xr-x - t