Push Notification Tester

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2.1 Added native error dialog from Play Services lib (prompt for Update etc.)
2.0 Redid App from Scratch using Material Design (only for Android 5.X and higher)
1.5 Updated to latest GCM API on Server & Client
1.4 Fixed a crash that happened on some 2.2 and 2.3 devices
1.3 Made the Test-Notification compatible with several automation Apps (e.g. Tasker)
1.2 Security update