That promised commit... custom packs

Alright, this is that promised commit from a bit of time ago; now custom
packs (such as the AcademyIntl Private Server Pack) work.  I've also
changed the format of the files as seen on the server, in such a way
that will allow for better sorting and management of versions.

Changes _ back to ^ as pack URL separator, .htaccess file splits and
handles it on the server (very basic implementation, will change to a
proper system in the near future.)

MD5 system working properly now.