Fix streaming over the external IP address when discovered via mDNS

Limelight/Database/Host.h

@@ -20,5 +20,6 @@
 @property (nonatomic, retain) NSString * mac;
 @property (nonatomic) BOOL online;
 @property (nonatomic) PairState pairState;
+@property (nonatomic) NSString * activeAddress;
 
 @end

Limelight/Database/Host.m

@@ -19,5 +19,6 @@
 @dynamic mac;
 @dynamic pairState;
 @synthesize online;
+@synthesize activeAddress;
 
 @end