Added ability to navigate to a url found in clipboard
Fix opening the wrong thread.

The occasional table cell was getting the wrong data on a refresh. This made it
look like you were going to the wrong thread when you tapped it; it would
suddenly switch to the right data when you came back to the thread list.
Fix for awfulUrl not working when there's no URL scheme/it's not really a url
Basic pasteboard thing
Merge branch 'PasteboardURL' of git://github.com/chwilliam/Awful into chwilliam-paste-url
Cancel button goes on the left.

Also moved the yesButtonTitle to go next to the onAcceptance block because they
go together.
Minor changes to prompting on copied URL.

Don't bother people multiple times for the same URL. And we'll show them the
URL so they know what they're saying yes to.