CC-2950: Tell users if they are running an out-of-date version or not

Get rid of hardcoded url for downloading the latest version, and use the url
stored in the stat server instead

airtime_mvc/public/js/airtime/dashboard/versiontooltip.js

@@ -40,6 +40,13 @@ function getLatestVersion() {
     return $("#version-latest").html();
 }
 
+/**
+ * Returns the download link to latest release in HTML
+ */
+function getLatestLink() {
+    return "<a href='" + $("#version-link").html() + "'>" + getLatestVersion() + "</a>";
+}
+
 /**
  * Returns true if current version is up to date
  */
@@ -51,13 +58,6 @@ function isUpToDate() {
     return (diff == 0 && current == latest) || diff < 0;
 }
 
-/**
- * Returns the download link to latest release in HTML
- */
-function getLatestLink() {
-    return "<a href='http://apt.sourcefabric.org/misc/'>" + getLatestVersion() + "</a>";
-}
-
 /**
  * Sets up the tooltip for version notification
  */