Turn off nginx logs on install

src/freedombone-utils-web

     # install nginx
     apt-get -yq install nginx php5-fpm git
 
+    # Turn off logs by default
+    sed -i 's|access_log.*|access_log = /dev/null;|g' /etc/nginx/nginx.conf
+    sed -i 's|error_log.*|error_log = /dev/null;|g' /etc/nginx/nginx.conf
+
     # limit the number of php processes
     sed -i 's/; process.max =.*/process.max = 32/g' /etc/php5/fpm/php-fpm.conf
     #sed -i 's/;process_control_timeout =.*/process_control_timeout = 300/g' /etc/php5/fpm/php-fpm.conf