* [AP_DOWNLOAD,CKAN_AP,SC,EXT] New module for downloading files in automated processes. Also support content negotiation over HTTP.
* [ARCHIVE_EXT,FIX] Expand `.tgz` to `.tar.gz`.
* [CKAN_MIME,EXT] Show HTTP content types.
* [RFC2616_ACCEPT,FIX] Typo.
* [URI_EXT,SC] Removed AP-specific code.