@ashfurrow => ability to dismiss conditions/privacy

Made the modal for terms and conditions/privacy look a little more design-y

I put in the navigation toolbar on the bottom because there are links to other documents on each of the pages we're presenting. We can talk to Katarina about this. They're tappable either way, but it's frustrating if you tap on something and can't get back.

Added a CLOSE button to the modal that looks like the CANCEL button we display throughout bid fullfillment.
i made these properties weak so that they will become nil whenever you dismiss the VC (like via the web view controller's close button) without requiring that you specifically call this method which explicitly sets the property to nil.