Upgraded to open_id_authentication plugin at 00d8bc7f97 and unpacked ruby-openid gem version 2.1.2.

vendor/gems/ruby-openid-2.1.2/lib/openid/extras.rb

@@ -0,0 +1,11 @@
+class String
+  def starts_with?(other)
+    head = self[0, other.length]
+    head == other
+  end
+
+  def ends_with?(other)
+    tail = self[-1 * other.length, other.length]
+    tail == other
+  end
+end