Minor cleanup:

• Add some docs.
 • Don't close over the bootstrap global in the persistent storage singleton.
 • Don't load overlay until we have the addon object for util.addon (experimental).
 • Other minor cleanup.

common/modules/protocol.jsm

@@ -102,7 +102,7 @@ ProtocolBase.prototype = {
             case "data":
                 try {
                     var channel = services.io.newChannel(uri.path.replace(/^\/(.*)(?:#.*)?/, "data:$1"),
-                                                       null, null);
+                                                         null, null);
                 }
                 catch (e) {
                     var error = e;