Changes with nginx 1.5.6                                         01 Oct 2013

*) Feature: the "fastcgi_buffering" directive.

*) Feature: the "proxy_ssl_protocols" and "proxy_ssl_ciphers"
directives.
Thanks to Piotr Sikora.

*) Feature: optimization of SSL handshakes when using long certificate
chains.

*) Feature: the mail proxy supports SMTP pipelining.

*) Bugfix: in the ngx_http_auth_basic_module when using "$apr1$"
password encryption method.
Thanks to Markus Linnala.

*) Bugfix: in MacOSX, Cygwin, and nginx/Windows incorrect location might
be used to process a request if locations were given using characters
in different cases.

*) Bugfix: automatic redirect with appended trailing slash for proxied
locations might not work.

*) Bugfix: in the mail proxy server.

*) Bugfix: in the ngx_http_spdy_module.
Merge tag 'v1.5.6'

Signed-off-by: paulyang <y_y@neusoft.com>