core: improved roster management + misc:

- updated methods to no use anymore methods deprecated in Wokkel
    - use of full jid when it make sense instead of bare jid
    - getContacts, updateContact and delContact are now asynchronous

src/plugins/plugin_xep_0054.py

@@ -102,9 +102,9 @@ class XEP_0054(object):
         #       the current naive approach keeps a map between all jids of all profiles
         #       in persistent cache, and check if cached jid are in roster, then put avatar
         #       hashs in memory.
-        for _jid in client.roster.getBareJids() + [client.jid.userhost()]:
-            if _jid in self.avatars_cache:
-                self.host.memory.updateEntityData(jid.JID(_jid), "avatar", self.avatars_cache[_jid], client.profile)
+        for _jid in client.roster.getJids() + [client.jid]:
+            if _jid.userhost() in self.avatars_cache:
+                self.host.memory.updateEntityData(_jid, "avatar", self.avatars_cache[_jid.userhost()], client.profile)
 
     def profileConnected(self, profile):
         client = self.host.getClient(profile)