For 3rd users scripts: !download

Summary:
This !download command allows the eggdrop to download a file remotely.

File is stored in filesystem incoming folder. If filesystem module is
not configured, Download(path) should be set to the download folder.

Dedicated to TOMJERRX.

Test Plan: !download www.perdu.com

Reviewers: dereckson

Differential Revision: http://devcentral.nasqueron.org/D389