Bug fixes & Feature addition

Removed certain manual settings from the install script that were
causing chatbots to fail to respond. The removed settings are still able
to be altered through the Admin page, but are given "default" values
during install.

Additionally, added support for uploading ZIP file archives of AIML
files, to make loading AIML categories less tedious. The upload limit is
still 2MB, but a zip file that size can hole a LOT of AIML files.