Moved discovery to a worker thread per host

Limelight/Network/DiscoveryWorker.h

@@ -0,0 +1,19 @@
+//
+//  DiscoveryWorker.h
+//  Limelight
+//
+//  Created by Diego Waxemberg on 1/2/15.
+//  Copyright (c) 2015 Limelight Stream. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import "Host.h"
+
+@interface DiscoveryWorker : NSOperation
+
+- (id) initWithHost:(Host*)host uniqueId:(NSString*)uniqueId cert:(NSData*)cert;
+- (Host*) getHost;
+
++ (void) updateHost:(Host*)host withServerInfo:(NSData*)serverInfoData;
+
+@end