Fix up fetching jquery.visibility

At some point the fetch-dependencies stopped working as the
visibility URL changed. Fix this up and also fix up adding the
danger class to ajax error messages

Closes-Bug: #1325076
Change-Id: I35af2fa08044f479c8f1200ba543cca908173aa8
diff --git a/etc/status/README.rst b/etc/status/README.rst
index 5b4a6bb..762b49c 100644
--- a/etc/status/README.rst
+++ b/etc/status/README.rst
@@ -19,8 +19,8 @@
 The script optimises updates by stopping when the page is not visible.
 This is done by listerning to ``show`` and ``hide`` events emitted by the
 Page Visibility plugin for jQuery. If you don't want to load this plugin you
-can undo undo this optimisation by removing the 9 lines using this on the
-bottom of ``app.js``
+can undo undo this optimisation by removing the code at the bottom of
+``index.html``
 
 To automatically fetch the latest versions of jQuery, the Page Visibility
 plugin and Twitter Boostrap, run the ``fetch-dependencies.sh`` script.