Close invitation connections after use.

briar-core/src/net/sf/briar/invitation/AliceConnector.java

@@ -97,5 +97,7 @@ class AliceConnector extends Connector {
 			Thread.currentThread().interrupt();
 			return;
 		}
+		// That's all, folks!
+		tryToClose(conn, false);
 	}
 }
\ No newline at end of file

briar-core/src/net/sf/briar/invitation/BobConnector.java

@@ -97,5 +97,7 @@ class BobConnector extends Connector {
 			Thread.currentThread().interrupt();
 			return;
 		}
+		// That's all, folks!
+		tryToClose(conn, false);
 	}
 }

briar-core/src/net/sf/briar/invitation/Connector.java

@@ -90,6 +90,7 @@ abstract class Connector extends Thread {
 	protected void tryToClose(DuplexTransportConnection conn,
 			boolean exception) {
 		try {
+			if(LOG.isLoggable(INFO)) LOG.info("Closing connection");
 			conn.dispose(exception, true);
 		} catch(IOException e) {
 			if(LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);