title: iPhone notification when wifi network changes
body: <p>This is for a <em>tweak</em>, so the target is jailbroken devices, and <em>not</em> the app store.
  I have tried hooking different methods in the <code>SBWiFiManager</code> but they either are called when the wifi strength changes (so continuously) or after quite delay after the network has changed.</p>
  
  <p>Is there any other way to get a notification (or another method to hook) went the wifi network changes? </p>
  
  <p>I know you can get the current SSID with public APIs now, but I need to be told when it changes.</p>