Updated Campaign Definition (markdown)
explain maxDimension intentions (eg. if set to 0, will allow unbounded photo sizes)
adjust video max length wording
clarify maxDimension
we actually do use <introText> and <submitText>..
clarify that values can be non-whole numbers.
added info about wholeNumber parameter for the number prompt
Updated a typo.
Updated the campaign URN requirement.
Added the audio prompt.
adding displayLabel back to required fields for prompts
Updated in accordance with #501.
Fixed some formatting for conditions.