Remove automatic retrieval of badge in ParseInstallation

[cbaker6]

Getting the badge value automatically is something native to the Objective-c SDK (and currently Parse-Swift). It requires using UIKit or AppKit to retrieve and accessing it properly means ParseInstallation has to always be called on the main queue. This leads to awkward implementation and usage of ParseInstallation. In addition, Parse-Swift works on OSs that don't have badges like Linux and Android.

I plan to remove the automatic retrieval of badge. If a developer wants to populate this field they can create their own dispatches before adding it to ParseInstallation.

This will lead to easier usage and less buggy and more predictable (example parse-community/Parse-SDK-iOS-OSX#1568) behavior when using ParseInstallation.

Feel free to comment with your thoughts...

[funkenstrahlen]

I think this is a good idea! 👍