Adding UIImageView categories from SDWebImage.

Usage

    #import "UIImageView+WebCache.h"

    [imageView setImageWithURL:url];
Show real house dining icons on list and menu screens.

Also, tweak spacing on list screen, scale icons to fit, make sure label rects are aligned on whole numbers to stop text blurriness, and update dining-sample.json to include the newest icon URLs.
Forgot this part of the meal item sort order commit.
Add a little more CGRectIntegral for safety.
Make Dining venue cell text turn white on highlight.
Deselect the venue's cell at the right time.

Since DiningMapListViewController isn't a subclass of UITableViewController, it doesn't automatically deselect selected cells in a nice animated way when coming back from further down the navigation stack. So, we need to do it ourselves in -[UIView viewWillAppear].
Set Dining navigation titles.

Also, show venue image on house dining info pages.