Better handle missing gzip archives

Thanks to @bibby for this improvement.

Multiple config files

Optionally specify multiple config files and the script will run once for each file. eg:

$ python ./MailmanArchiveScraper.py ~/lists/*.cfg

Add support for non-English language installations

Tested on a couple of French and Spanish sites.

Improvements to RSS

Various improvements to the RSS files generated.

Add generation of RSS files

The script can now generate an RSS feed of the most recent posts to the mailing list.

Add ability to archive text/gzip files

The monthly text files, possibly gzipped, can be archived using a new script.

Initial release

What it says.

Add https support

The script can now archive files served over https.