Revert 1c909d84822f

Restore declarations of window.liberator and modules.liberator.  These afford
some compatibility for plugins with liberator apps.

--HG--
extra : rebase_source : 8b0ca4c9365f0da89045ec4d76845e7ddee811fc

common/content/dactyl.js

@@ -28,6 +28,9 @@ const FailedAssertion = Class("FailedAssertion", Error, {
 const Dactyl = Module("dactyl", {
     init: function () {
         window.dactyl = this;
+        // cheap attempt at compatibility
+        window.liberator = this;
+        modules.liberator = this;
         this.observers = {};
         this.modules = modules;