bugfix: failed to build on 32bits Linux OS. 

bugfix: failed to build on 32bits Linux OS. 

bugfix: did't free ngx_regex_match_context. 

bugfix: fixed warning. 

bugfix: failed to build with openssl 1.x.x and boringssl. 

optimize: fixed build warning. 

feature: bumped api version to 17. 

bumped version of stream-lua-nginx-module to 16. 

bugfix: failed to build on windows. 

bumped stream-lua-nginx-module to 15.