Sort menu items

[znek]

Sort by BuildResult first, lastBuild.timestamp second

This addresses Issue #6

NOTE: This shouldn't be merged as-is, but instead there should be a preference pane where sort-orderings could be made arrangeable. I just needed it to be like this, others might, too.

NOTE2: I really can't code Swift, I just guessed it by looking at examples. Feel free to correct my code and make it pretty. ;-)