merge changes between nginx 1.2.6 and nginx 1.2.7
Merge pull request #188 from cfsego/calibaba

merge changes between nginx 1.2.6 and nginx 1.2.7
updated the README
Merge pull request #193 from zhuzhaoyuan/update-readme2

updated the README
disable 408 response record any access log with empty request.

In SSL application, Chrome browser may establish extra connections
and doesn't send any data. This will cause a 408 record in the access.log.
Now we could disable this meaningless record with directive 'log_empty_request'.
Merge pull request #195 from yaoweibin/log_empty_request_408

disable 408 response record any access log with empty request.
add session_sticky_modules for tengine
Merge pull request #205 from dinic/session_sticky2

add session_sticky_modules for tengine
added the CHANGES for tengine-1.4.4
Merge pull request #206 from yaoweibin/tengine-1.4.4-2

added the CHANGES for tengine-1.4.4
bumped version to tengine-1.4.5
Merge pull request #207 from yaoweibin/bump-tengine-1.4.5

bumped version to tengine-1.4.5
check args of session_sticky_module when start tengine
Merge pull request #211 from dinic/session_sticky5

check args of session_sticky_module when start tengine
modify the ngx_pcalloc function.
Merge pull request #214 from lnwdl/topic

modify the ngx_pcalloc function.
recover the status in the check_http_expect_alive directive
Merge remote-tracking branch 'taobao/master' into dynamic_upstream_check