Deleted the leftover augmentor events publisher classes.
The ad server connector will no longer mislabel VISIT events as IMPRESSION events.
Added support for the OpenRTB data sources extension.

This allows an agent to specify which data sources were used to make a
bid decision. This change only limits itself to the router and the
bidding agent. We will still need to have the open rtb connector read
this data and send it back to the exchange.