Skip archives which do not contain tarballs.

* DAZJORZ/term-prompt-0.05.tar.gz is a single line, gzipped
* BILLWALZ/Data-Shark-v2.1.tar.gz is an HTML page, gzipped
Replace invalid author emails with cpan.org addresses.

This deals with tricksters like SPROUT otherwise git will choke on an
invalid committer email.

Oh, and our invalid email check was broken.  Everyone was getting a
cpan.org address. :-/
Merge branch 'issue/86'

For #86