XMPPContactManager: Support for handling subscription requests

src/XMPPContactManager.h

@@ -57,6 +57,15 @@
 - (void)contactManager: (XMPPContactManager*)manager
       didRemoveContact: (XMPPContact*)contact;
 
+/**
+ * \brief This callback is called when a subscription request is received
+ *
+ * \param manager The contact manager that received the request
+ * \param presence The type=subscribe presence
+ */
+-          (void)contactManager: (XMPPContactManager*)manager
+  didReceiveSubscriptionRequest: (XMPPPresence*)presence;
+
 /**
  * \brief This callback is called whenever a contact is about to change its
  *	  roster item
@@ -118,6 +127,9 @@
 - initWithConnection: (XMPPConnection*)connection
 	      roster: (XMPPRoster*)roster;
 
+- (void)sendSubscribedToJID: (XMPPJID*)subscriber;
+- (void)sendUnsubscribedToJID: (XMPPJID*)subscriber;
+
 /**
  * \brief Adds the specified delegate.
  *