add function: ngx_encode_base64url()
Added variable full_request
Added escape_uri_ variable
Merge pull request #361 from yzprofile/dev

Added variable full_request & Added escape_uri_ variable
Merge pull request #359 from lilbedwin/base64url

add function: ngx_encode_base64url()
do not trim html comment of ssi/esi
Merge pull request #363 from taoyuanyuan/master

trim不删除ssi和esi的注释
Merge commit 'taobao/master' into new_request_no_buffering_chunked