All references to the server URL have been removed.

The campaign definitions may continue to include a server URL; however, it will not be validated or used and may not even be saved in the future.

References #501
Removed all references to showSummary, editSummary, summaryText, and abbreviatedSummary.

References #501
Changed the 'res' to 'maxDimension' for photo prompts.

Photo prompts now have a more-explicit name for their dimension property. It will be used to indicate the maximum allowed dimension for an image.

References #501
Removed all references to 'displayType'.

References #501
The maximum number of seconds for a video is now optional.

There are also a few minor fixes and comment updates for the photo prompt.

References #501