title: How to install my app as system app using system signature
body: <p>I am newbie to android and even to stack overflow. I created one sample application and it is running fine, .apk file is get created. Now my question is how to prepare it for publishing. i know there is many sites which explains this.
  Like <a href="http://developer.android.com/tools/publishing/preparing.html" rel="nofollow">http://developer.android.com/tools/publishing/preparing.html</a>
   I am little confused i want sign my app using system signature of emulator. I means i want install it as a system app. please help me.. </p>