Update app icon.

Fixes some stray pixels.

I also removed the iTunesArtwork files as I don't think they do anything for us.
Nicer profile view based on @ridilla's mockup.

Mockup looked great. Now shown on iPad as a modal view, with the two sections
stacked horizontally. This fixes #156.

Profile view can bounce when it scrolls, so it doesn't feel weird anymore.

And there's no more gap at the top of a profile view for users with no avatar or custom title.
Fix iPhone Spotlight icons.

Edges were a bit harsh.
Parsing last page updates last post date/author.
Add "view OP's profile" item to thread menu.
Move "View Profile" to post actions menu.

Long-tapping the username/avatar is a bad experience, especially in VoiceOver.
You'd end up selecting text when you were trying to see the profile.
Enable assertions in release mode.

I'd rather crash than stumble forward.
Removed ReplyViewController changes
pull upstream master