Log Message:
Update to 2.21

Upstream changes:
2.21 Mon Jun  9 01:35:54 CEST 2014
	- correctly keep body when redirecting POSTs, instead of
          deleting them.

2.2  Mon Jun  9 01:31:46 CEST 2014
	- connection header was malformed (patch by Raphael Geissert).
	- add lots of known idempotent methods from httpbis.
        - implement relative location headers (rfc 7231), with fallback on URI.
        - add support for status code 308 from rfc 7238.
        - recommend URI.