LN: Some fixes & cleanup (Squashed commits)
- Fix bug that the notification is launched when a button on it is pressed
- Show new notifications first
- Fix FC on launching hangouts notification
- Beautify
- Fix possible NPE (Thanks to Der-Schubi)
- Please don't die (Thanks to Evisceration)

Squashed by @AragaoAnderson

Change-Id: I4caa5be567a19b0da5e606ef94165ea57f4d780a