divide ngx_http_mruby_module.(c|h) into ngx_http_mruby_(handler|hook).(c|h)
unify format of copyright header
add me to AUTHORS
Merge pull request #23 from cubicdaiya/improvements/source_cleaning

divide ngx_http_mruby_module.(c|h) into ngx_http_mruby_(handler|hook).(c...