Added HTTPS param with Apache-like behaviour to fastcgi/scgi/uwsgi_params (fixes #38).

conf/fastcgi_params

diff --git a/conf/fastcgi_params b/conf/fastcgi_params
index 201c686..71e2c2e 100644
--- a/conf/fastcgi_params
+++ b/conf/fastcgi_params
@@ -9,6 +9,7 @@
 fastcgi_param  DOCUMENT_URI       $document_uri;
 fastcgi_param  DOCUMENT_ROOT      $document_root;
 fastcgi_param  SERVER_PROTOCOL    $server_protocol;
+fastcgi_param  HTTPS              $https if_not_empty;
 
 fastcgi_param  GATEWAY_INTERFACE  CGI/1.1;
 fastcgi_param  SERVER_SOFTWARE    nginx/$nginx_version;

conf/scgi_params

diff --git a/conf/scgi_params b/conf/scgi_params
index 257167e..47348ca 100644
--- a/conf/scgi_params
+++ b/conf/scgi_params
@@ -8,6 +8,7 @@
 scgi_param  DOCUMENT_ROOT      $document_root;
 scgi_param  SCGI               1;
 scgi_param  SERVER_PROTOCOL    $server_protocol;
+scgi_param  HTTPS              $https if_not_empty;
 
 scgi_param  REMOTE_ADDR        $remote_addr;
 scgi_param  REMOTE_PORT        $remote_port;

conf/uwsgi_params

diff --git a/conf/uwsgi_params b/conf/uwsgi_params
index b57e8e7..f539451 100644
--- a/conf/uwsgi_params
+++ b/conf/uwsgi_params
@@ -8,6 +8,7 @@
 uwsgi_param  PATH_INFO          $document_uri;
 uwsgi_param  DOCUMENT_ROOT      $document_root;
 uwsgi_param  SERVER_PROTOCOL    $server_protocol;
+uwsgi_param  HTTPS              $https if_not_empty;
 
 uwsgi_param  REMOTE_ADDR        $remote_addr;
 uwsgi_param  REMOTE_PORT        $remote_port;