moved add_to_cache to avcache.py and added the profile_image_url to results from searches and dms

avcache.py

@@ -1,4 +1,6 @@
 from threading import RLock
+from urllib2 import URLError,urlopen
+import gtk
 
 
 class AvCache:
@@ -38,3 +40,26 @@ class AvCache:
         return setattr(self.__instance, attr, value)
 
 # end class AvCache
+
+
+def add_to_cache(user):
+    """
+    This helping function takes a python-twitter User object, grabs the image
+    data from the image_url and adds it to the AvCache with the screen_name as
+    the key.
+    """
+    with AvCache().lock:
+        hit = AvCache().map.has_key(user.screen_name)
+    if not hit:
+        try:
+            url = urlopen(user.profile.image_url)
+            data = url.read()
+            loader = gtk.gdk.PixbufLoader()
+            loader.write(str(data))
+            image = loader.get_pixbuf()
+            loader.close()
+            
+            with AvCache().lock:
+                AvCache().map[user.screen_name] = image
+        except URLError:
+            pass # Nothing needs be done, just catch & ignore