minor coding style fixes and also made ngx_http_set_misc_set_secure_random_common a static function.
doc: markdown tweaks.
feature: added new config directives set_formatted_gmt_time and set_formatted_local_time. thanks Trurl McByte for the patch in #11.
doc: documented the set_formatted_gmt_time and set_formatted_local_time.
merge to upstream