neon: release 0.28.4

[Joe Orton]

Download: http://www.webdav.org/neon/neon-0.28.4.tar.gz
Signature: http://www.webdav.org/neon/neon-0.28.4.tar.gz.asc
 MD5: 6c3b94362af743d046e198e9fcbe4a85  neon-0.28.4.tar.gz
SHA1: f2685b56cecf754cb51ac69f974ea090ea85c75e  neon-0.28.4.tar.gz

Changes in release 0.28.4:
* Fix ne_forget_auth (Kai Sommerfeld)
* GnuTLS support fixes:
 - fix handling of PKCS#12 client certs with multiple certs or keys
 - fix crash with OpenPGP certificate
 - use pkg-config data in configure, in preference to libgnutls-config
* Add PKCS#11 support for OpenSSL builds (where pakchois is available)
* Fix small memory leak in PKCS#11 code.