Previously, users were not able to pass in a compressed As-Names file,
but they were able to pass in a compressed IP-ASN Database.  For those
trying to work with a single file-format / or compression apporach, this
feature enables that.

Previously, users were not able to pass in a compressed As-Names file,
but they were able to pass in a compressed IP-ASN Database.  For those
trying to work with a single file-format / or compression apporach, this
feature enables that.

Previously, FTP download options were the only option.  For those of us
operating behind stricter firewalls, FTP is sometimes blocked since
it's harder to inspect packets.

This commit adds the ability to download the BGP RIB file via HTTP.
One should note that it only supports IPv4.

…into add-http-download-method