fixed the mismatch footer module configure option

renamed '--without-http_footer_module' to '--without-http_footer_filter_module'
Merge pull request #269 from yaoweibin/footer_filter

fixed the mismatch footer module configure option
add ngx_http_trim_filter_module
Merge pull request #274 from taoyuanyuan/t

added ngx_http_trim_filter_module
fixed a bug of trim module when javascript is a regular expression.
bugfix.
Merge pull request #276 from taoyuanyuan/t

fixed a bug of trim module when javascript is a regular expression.
round robin: optimize loop in ngx_http_upstream_init_round_robin()

 It is a trivial patch to move continue statement from inner loop to outer
 loop.
Merge pull request #279 from chobits/master

round robin: optimize loop in ngx_http_upstream_init_round_robin()
Merge remote-tracking branch 'taobao/master' into request_no_buffering2