support paperclip with a sad monkeypatch

config/initializers/monkeypatch.rb

@@ -0,0 +1,9 @@
+# We need to monkeypatch this in because paperclip internally uses URI.escape, and
+# Rails 3 drops URI.escape support in favor of CGI.escape. After we've migrated off
+# paperclip (or paperclip stops sucking), we can remove this monkeypatch.
+
+module URI
+  def URI.escape(url)
+    CGI.escape(url)
+  end
+end