build rbtree to store upstreams so as to improve performance when searching for upstreams
fix a format issue
fix a format issue
use implicit_upstreams together with rbtree to modify performance when upstream is not found in rbtree
health check supported fastcgi
Changed check_fastcgi_params to check_fastcgi_params
Added the documents of check_fastcgi
Fixed the style of fastcgi_check document
use rbtree to make configuration loading faster
add ngx_http_reqstat_module
image_filter support crop_keepx/crop_keepy

crop_keepx reduces the image by width and crops extraneous edges by height.
crop_keepy reduces the image by height and crops extraneous edges by width.
修复session sticky加上option=indirect选项导致http 变量乱掉的bug
Merge pull request #449 from dinic/session_sticky_boke_bugfix

修复session sticky加上option=indirect选项导致http 变量乱掉的bug
Build an red-black tree to store upstreams added by the directive "upstream"
Thanks to SarahWang
Merge pull request #446 from cfsego/reqstat_new

可以基于虚拟主机统计的统计模块
add doc for ngx_http_reqstat_module
bugfix: dest dir is not correct
Merge pull request #451 from cfsego/new_reqstat

add doc for ngx_http_reqstat_module
bugfix 回滚
Merge pull request #454 from dinic/session_sticky_boke_bugfix

it looks good to me
Bugfixed: rewrite directive do not use ngx_http_named_location