Wawa may be abandoning Center City, but for those of you not affected by the desertion, there's good news—especially if you're a young professional addicted to your Crackberry, or a teenager who can't put your Sidekick down during Calculus class: Select Wawa locations will now let you text message your sandwich orders straight to the store. You can order online, too, but let's think for a moment here. Online ordering is nothing new. But text......