Mod_zip 1.1.3: optional CRC-32's

By popular demand…

*) Feature: If the CRC-32 field is set to “-”, the checksum will be
calculated on the fly (note: mod_zip will then disable support for the

*) Bugfix: occasional crash when files returned 404

*) Bugfix: better compatibility with Safari on Mac OS X (but only when
CRC-32’s are provided)

Download, installation, etc.: