Vnotify doesn't utilize the subtitle or icon_url variables


I discovered this while using VNotify in my project, the icon is a nice addition to brand your app that is integrating with the API and not using the Subtitle causes some strange formatting issues, the notifications are much more attractive when you use the Subtitle. See attached screenshot for a before and after example, the top notification includes the subtitle and utilizes the long_message_preview variable.
I modified the code for my project and have generated a patch file in SVN, as thanks for making this library.

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