Add logging to help track down problems with Sync

Seems like we're running into errors sending the message to kick off the
sync, so positive logging as well as error logging is included.

FREEBIE

libtextsecure/sync_request.js

@@ -19,8 +19,15 @@
         this.ongroup = this.onGroupSyncComplete.bind(this);
         receiver.addEventListener('groupsync', this.ongroup);
 
+        console.log('SyncRequest created. Sending contact sync message...');
         sender.sendRequestContactSyncMessage().then(function() {
-            sender.sendRequestGroupSyncMessage();
+            console.log('SyncRequest now sending group sync messsage...');
+            return sender.sendRequestGroupSyncMessage();
+        }).catch(function(error) {
+            console.log(
+                'SyncRequest error:',
+                error && error.stack ? error.stack : error
+            );
         });
         this.timeout = setTimeout(this.onTimeout.bind(this), 60000);
     }