Tighten the design on the home screen

[orta]

Updates the home screen to be a bit shorter, and to fit the version label more naturally

Works fine in the info mode about the command line tools

Also updates the tableview for items, now selection state for the subtitle, used to look like this:

Now looks like:

[orta]

Also, improves the error messaging for people who have installed CocoaPods via the gem install cocoapods commands. a2dcd30

[orta]

Also added the ability to disable Sparkle updates via menu item: 9e11660

[orta]

OK, done a review, I'm cool with this.