Sort series into groups by reading status

[rosszurowski]

When opening up Poketo, I have to sort through a big list of series I'm following in order to find the few I'm actively reading. I've added and subsequently forgotten about a few series when it gets lost in that list :(

Let's try grouping series into a few categories to make things easier to find:

• New Releases: sorted by most recently released
• Reading: series where you're still catching up
• Waiting: series where you're caught up, but there are no updates (hidden by default)