Added the option to open navigation drawer instead of leaving app on
first "back" press when in notes list. Yes, I love anti-patterns.
List view has now a fading animation to give a smoother sensation
List animation is performed only when changing navigation to avoid
interference with fragment transition animation
Fixed app tour with fragments
Added swipe-to-create-new-note instructions into app tour
Fixed notification target after having restored a backup
ListView not restores perfectly position, offset included, so also
partial notes will be shown
Fixed a NullPointerException