add Spdy option

install/sql/incremental/upd_0080.sql

install/sql/ispconfig3.sql

install/tpl/server.ini.master

interface/web/admin/form/server_config.tform.php

interface/web/admin/lib/lang/de_server_config.lng

interface/web/admin/lib/lang/en_server_config.lng

interface/web/admin/templates/server_config_web_edit.htm

interface/web/sites/form/web_vhost_domain.tform.php

interface/web/sites/lib/lang/de_web_vhost_domain.lng

interface/web/sites/lib/lang/en_web_vhost_domain.lng

interface/web/sites/templates/web_vhost_domain_advanced.htm

interface/web/sites/templates/web_vhost_domain_ssl.htm

server/conf/apache_apps.vhost.master

server/conf/nginx_vhost.conf.master

server/plugins-available/nginx_plugin.inc.php