Appended timestamp to log file names

src/main/java/envoy/client/util/EnvoyLog.java

@@ -2,6 +2,8 @@ package envoy.client.util;
 
 import java.io.File;
 import java.io.IOException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
 import java.util.logging.*;
 
 import envoy.client.data.Config;
@@ -25,7 +27,8 @@ public class EnvoyLog {
 		LogManager.getLogManager().reset();
 
 		// Configure log file
-		File logFile = new File(Config.getInstance().getHomeDirectory(), "log/envoy_user.log");
+		File logFile = new File(Config.getInstance().getHomeDirectory(),
+				"log/envoy_user_" + new SimpleDateFormat("yyyy-MM-dd--hh-mm-mm").format(new Date()) + ".log");
 		logFile.getParentFile().mkdirs();
 
 		// Configure formatting