Implemented Retweet api, and removed the update_window from update_status because twitter's post delay is too long for that to be feasible

mytwitter.py

@@ -91,7 +91,6 @@ class MyTwitter():
         self.update_entry.set_text("")
         self.api.PostUpdate(text, in_reply_to_status_id=self.reply_id)
         self.reply_id = None
-        self.update_window()
         
 
     def update_status_callback(self, widget):
@@ -128,9 +127,8 @@ class MyTwitter():
         self.update_entry.grab_focus()
 
 
-    # fixme: need to implement the retweet API in python-twitter to continue
     def on_retweet(self, widget):
-        pass
+        self.api.Retweet(widget.id)
 
 ### end class MyTwitter