* fix warnings of type mismatch (#298)

Destination.h

@@ -28,8 +28,8 @@ namespace client
 	const int PUBLISH_CONFIRMATION_TIMEOUT = 5; // in seconds
 	const int LEASESET_REQUEST_TIMEOUT = 5; // in seconds
 	const int MAX_LEASESET_REQUEST_TIMEOUT = 40; // in seconds
-	const int MAX_NUM_FLOODFILLS_PER_REQUEST = 7;
 	const int DESTINATION_CLEANUP_TIMEOUT = 20; // in minutes 
+	const unsigned int MAX_NUM_FLOODFILLS_PER_REQUEST = 7;
 	
 	// I2CP
 	const char I2CP_PARAM_INBOUND_TUNNEL_LENGTH[] = "inbound.length";

I2NPProtocol.h

@@ -97,7 +97,7 @@ namespace i2p
 	const uint8_t DATABASE_LOOKUP_TYPE_ROUTERINFO_LOOKUP = 0x08; // 1000			
 	const uint8_t DATABASE_LOOKUP_TYPE_EXPLORATORY_LOOKUP = 0x0C; // 1100
 
-	const int MAX_NUM_TRANSIT_TUNNELS = 2500;
+	const unsigned int MAX_NUM_TRANSIT_TUNNELS = 2500;
 
 namespace tunnel
 {		

SSUData.h

@@ -27,8 +27,8 @@ namespace transport
 	const int RESEND_INTERVAL = 3; // in seconds
 	const int MAX_NUM_RESENDS = 5;
 	const int DECAY_INTERVAL = 20; // in seconds
-	const int MAX_NUM_RECEIVED_MESSAGES = 1000; // how many msgID we store for duplicates check
 	const int INCOMPLETE_MESSAGES_CLEANUP_TIMEOUT = 30; // in seconds
+	const unsigned int MAX_NUM_RECEIVED_MESSAGES = 1000; // how many msgID we store for duplicates check
 	// data flags
 	const uint8_t DATA_FLAG_EXTENDED_DATA_INCLUDED = 0x02;
 	const uint8_t DATA_FLAG_WANT_REPLY = 0x04;