Added opencaching.ro installation

Author: boguslaw.szczepanowski

etc/installations.xml

@@ -8,5 +8,6 @@
   <installation site_url="http://www.opencaching.de/"/>
   <installation site_url="http://www.opencaching.us/"/>
   <installation site_url="http://www.opencaching.nl/"/>
+  <installation site_url="http://www.opencaching.ro/"/>
   <installation site_url="http://www.opencaching.org.uk/"/>
 </installations>