Enhancement: Add an option for different notification icon

[orelzion]

Currently, users see an alert icon which is most of the time the wrong icon to show

You should really add an option to change the small notification icon

[VihaanVerma89]

This project seems scraped if you have a look at their commit graph. I was almost 80% done when I came across two issues

1. App notification icons are not configurable
2. In app message image is not displayed properly since it is centre cropped.

Fix:

1. import the github project and add
   compile project(path: ':notifications')
   in your build.gradle
2. Open NotificationManager.java file and add your own notification icon.
3. Open BitmapAssetHandler and comment
   // imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);