Merge branch 'nginx-js-css-compress' into 'master'

Also compress .js and .css file

See merge request !412

nginx.conf

 server {
     listen       80;
     server_name  localhost;
+
     gzip         on;
+    gzip_vary    on;
+    gzip_types   text/css text/javascript application/x-javascript;
 
     location / {
         root      /usr/share/nginx/html;