Created new host discovery system

- now store host uuid and mac address
- use uuid to check for duplicate hosts
- try local and external IPs
- pair status is shown
- server status is shown
- validate host when manually adding

Limelight/Network/DiscoveryManager.h

@@ -0,0 +1,27 @@
+//
+//  DiscoveryManager.h
+//  Limelight
+//
+//  Created by Diego Waxemberg on 1/1/15.
+//  Copyright (c) 2015 Limelight Stream. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import "MDNSManager.h"
+#import "Host.h"
+
+@protocol DiscoveryCallback <NSObject>
+
+- (void) updateAllHosts:(NSArray*)hosts;
+
+@end
+
+@interface DiscoveryManager : NSOperation <MDNSCallback>
+
+- (id) initWithHosts:(NSArray*)hosts andCallback:(id<DiscoveryCallback>) callback;
+- (void) startDiscovery;
+- (void) stopDiscovery;
+- (void) addHostToDiscovery:(Host*)host;
+- (void) discoverHost:(NSString*)hostAddress withCallback:(void (^)(Host*))callback;
+
+@end