Add Ad4Push library and start integration
Add Ad4Push tracker initialization using activity methods callbacks
Changed Application class to suits Ad4Push SDK
Add methods to Ad4PushTracker for tracking screen, user and event. Add tests for these methods.
Add Manifest nodes for Ad4Push
Remove workspace.xml
Change LifeCycleTracking methods name
Update RIUserTracking interface with 2 different methods to suits Ad4Push needs. Change tests accordingly. Add push notification broadcast receiver
Merge branch 'feature_advanced-app-launch' into feature_ad4push-basic-integration

Conflicts:
	RITracking/app/src/androidTest/java/de/rocketinternet/android/tracking/core/RITrackingTest.java
	RITracking/app/src/main/AndroidManifest.xml
	RITracking/app/src/main/assets/ri_tracking_config.properties
	RITracking/app/src/main/java/de/rocketinternet/android/tracking/RIMainExampleActivity.java
	RITracking/app/src/main/java/de/rocketinternet/android/tracking/containers/RITrackingActivity.java
Change GTM file in test package
Add splash screen activity to block push notification of Ad4Push library. Add callback to LifeCycle interface. Rename samples in a consistent way. Add tests.
Update README.md file
Update README.md file syntax
Add common receiver for intercepting installation and comment receivers declaration in manifest for both Google Tag Manager and Ad4Push
Add missing method callbacks to SplashScreen activity
Merge pull request #3 from AlexBalo/feature_ad4push-basic-integration

Feature ad4push basic integration