feat(background-mode): replace event listeners with on method
feat(background-mode): replace event listeners with on method

The methods onactivate, ondeactive and onfailure no longer exist. You must now use `on` method.

driftyco/ionic-native,klirix/ionic-native,driftyco/ionic-native,driftyco/ionic-native,klirix/ionic-native,klirix/ionic-native