Add a timeout to ResourceDownloader network connection code.

Author: carlosame

src/io/sf/carte/doc/agent/net/ResourceDownloader.java

@@ -150,6 +150,7 @@ protected InputStream openStream() throws IOException {
 		} else {
 			con = getURL().openConnection();
 		}
+		con.setConnectTimeout(60000);
 		contentType = con.getContentType();
 		return con.getInputStream();
 	}