Streaming notifications are added to bottom of notifications view

[martensitingale]

They should appear at the top, of course.

I think this is due to NotificationView.prepend actually appending the status to the end of the list. It seems that TimelineView.prepend, similarly, actually appends the status to the end of the list, but unlike the notification view it has a boolean argument first which when passed true will prepend instead of appending.

Maybe appending/prepending to a view should be factored into a simple implementation shared between all views?

[bleakgrey]

Disregard function names, they're a relic from an early alpha. I'm going to restructure all of this mess in my multiple-accounts branch anyway.

Looks like I forgot to copy the Home timeline behavior for new data. Whoops.