fix "plugins" to "liberator.plugins"

Author: Jagua

twittperator/add-url-completer.tw

@@ -47,7 +47,7 @@ THE POSSIBILITY OF SUCH DAMAGE.
       context.title = ['Tweeted URL', 'Tweeted text'];
       context.filters = [CompletionContext.Filter.textAndDescription];
       let cs = [];
-      for (let [, t] in Iterator(plugins.twittperator.Tweets)) {
+      for (let [, t] in Iterator(liberator.plugins.twittperator.Tweets)) {
         if (!(t.entities && t.entities.urls))
           continue;
         for (let [, u] in Iterator(t.entities.urls)) {

twittperator/reply-popup-alert.tw

@@ -18,7 +18,7 @@
     return popupAlert(icon, title, text, false, null, null);
   }
 
-  plugins.twittperator.ChirpUserStream.addListener(
+  liberator.plugins.twittperator.ChirpUserStream.addListener(
     function onMsg (msg, raw) {
       if (msg.text && msg.user && msg.in_reply_to_screen_name === screenName)
         simplePopupAlert(msg.user.screen_name, msg.text, msg.user.profile_image_url);