Minor activity class cleanup

app/src/main/java/org/traccar/client/TraccarActivity.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 - 2014 Anton Tananaev (anton.tananaev@gmail.com)
+ * Copyright 2012 - 2015 Anton Tananaev (anton.tananaev@gmail.com)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,8 +15,6 @@
  */
 package org.traccar.client;
 
-import android.app.ActivityManager;
-import android.app.ActivityManager.RunningServiceInfo;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
@@ -27,12 +25,8 @@ import android.preference.PreferenceManager;
 import android.preference.PreferenceScreen;
 import android.telephony.TelephonyManager;
 import android.view.Menu;
-import android.view.MenuInflater;
 import android.view.MenuItem;
 
-/**
- * Main user interface
- */
 @SuppressWarnings("deprecation")
 public class TraccarActivity extends PreferenceActivity {