Merge branch 'bus-daemon' into 'master'

Add a Bus Daemon

This is helpful for when the server is under heavy load to ensure that the script is only ever ran once every second.
If you use this daemon, be sure that busproxy.php is aliased in apache to serve bus.json.

scripts/bus-daemon-upstart.conf

+description "maps.unl.edu bus location proxy"
+author "mfairchild365@gmail.com"
+# used to be: start on startup
+# until we found some mounts weren't ready yet while booting:
+start on runlevel [2345]
+stop on runlevel [06]
+# Automatically Respawn:
+respawn
+respawn limit 15 5
+script
+#configure the path
+exec while true; do php /var/www/html/maps/www/busproxy.php; sleep 1; done
+
+end script
+post-start script
+# Optionally put a script here that will notify you node has (re)started
+end script
\ No newline at end of file

www/busproxy.php

 <?php
 
 $url = 'http://getonboard.lincoln.ne.gov/packet/json/vehicle?lastVehicleHttpRequestTime=0';
-$file = 'bus.json';
+$file = __DIR__ . '/bus.json';
 $seconds_to_cache = 1;
 
 if (!file_exists($file) || time() - $seconds_to_cache >= filemtime($file)) {