Slightly wrapping paste error middleware and turning it on

Now we can show a nice "borked goblin" error :)

paste.ini

@@ -1,7 +1,11 @@
 [DEFAULT]
-debug = true
+# Set to true to enable web-based debugging messages and etc.
+debug = false
 
-[composite:main]
+[pipeline:main]
+pipeline = errors routing
+
+[composite:routing]
 use = egg:Paste#urlmap
 / = mediagoblin
 /mgoblin_media/ = publicstore_serve
@@ -28,6 +32,10 @@ beaker.session.key = mediagoblin
 beaker.session.data_dir = %(here)s/user_dev/beaker/sessions/data
 beaker.session.lock_dir = %(here)s/user_dev/beaker/sessions/lock
 
+[filter:errors]
+use = egg:mediagoblin#errors
+debug = false
+
 [server:main]
 use = egg:Paste#http
 host = 127.0.0.1