config: Fix 'massage' -> 'message' typo

Signed-off-by: François Boulogne <fboulogne sciunto org>
Signed-off-by: W. Trevor King <wking@tremily.us>
post_process.redirect: Add hook to remove redirections

Signed-off-by: François Boulogne <fboulogne sciunto org>
Signed-off-by: W. Trevor King <wking@tremily.us>
post_process.redirect: Specify user-agent

Signed-off-by: François Boulogne <fboulogne sciunto org>
Signed-off-by: W. Trevor King <wking@tremily.us>
post_process.redirect: Add support for enclosures

Signed-off-by: François Boulogne <fboulogne sciunto org>