better name + docs for played_before (renamed to known_player)

friends.py

@@ -59,7 +59,7 @@ def add(sender, names):
 
   for name in names:
     player = server.getOfflinePlayer(name)
-    if played_before(player):
+    if known_player(player):
       player_id = uid(player)
       not_yourself = player != sender
 
@@ -93,7 +93,7 @@ def rem(sender, names):
 
   for name in names:
     player = server.getOfflinePlayer(name)
-    if played_before(player):
+    if known_player(player):
       player_id = uid(player)
       if player_id in friends.get(sender_id, []):
         friends[sender_id].remove(player_id)

helpers.py

@@ -158,10 +158,11 @@ def retrieve_player(uuid_str):
   return server.getOfflinePlayer(juuid(uuid_str))
 
 
-def played_before(player):
+def known_player(player):
   """
-  returns True if the player has played before
+  to be used on OfflinePlayer
-  this is different to getHasPlayed(), which will return False on first join
+  returns True if the player has been on the server
+  this is different to HasPlayedBefore(), which will return False on first join
   """
   return player.getFirstPlayed() != 0