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