Added a hack to de-duplicate hosts and some more checks when adding a host to minimize the chances for dupes

Limelight/Network/CleanupCrew.h

@@ -0,0 +1,22 @@
+//
+//  CleanupCrew.h
+//  Limelight
+//
+//  Created by Diego Waxemberg on 4/5/15.
+//  Copyright (c) 2015 Limelight Stream. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import "Host.h"
+
+@protocol CleanupCallback <NSObject>
+
+- (void) cleanedUpHosts:(NSSet*) host;
+
+@end
+
+@interface CleanupCrew : NSOperation
+
+- (id) initWithHostList:(NSArray*) hostList andCallback:(id<CleanupCallback>)callback;
+
+@end