Adding gpg verify checksums

A simple script to iteratively verify sha1sum.txt files.
gpg script sign sha1sum.txt files

A simple script to iteratively sign sha1sum.txt files.
Thus essentially signing all of the files checksummed with one file.
gpg script to validate sha1sum.txt.sig files

This script iteratively validates sha1sum.txt.sig files against
their sha1sum.txt counter parts.