Battery Watcher v1.13

I just released a new version of the Battery Watcher app.  Hopefully, it will address some of the battery usage problems that people have been reporting.  The changes in this release are:

• Only update the widget while the screen is on.
• Update the widget whenever the screen turns on.
• Increase the time delay between updates to reduce any residual hit on battery life.
• Only update the widget itself if the battery level has changed since the last update.