* Use sed to insert version number when building, therefore no need to Build-Depend on perl any more. * Only write body to cached file on success (200). * Rework handling of If-Modified request response. Client errors also count as EXPIRED. Delete cached files in these circumstances (closes: #708884). * return_file() never returns a retry code, so don't test for it. * Update debian/control file description. Integrate experimental features (multi-distro, Debian Bugs SOAP and HTTPS CONNECT) as established. * Add Ubuntu 14.04 codename 'Trusty'.