Add license to data

[nickevansuk]

Please also add a license to each page as follows:

{
  "next": "/prod/getSessions?afterTimestamp=2016-05-23T15:42:05.568Z&afterID=2055",
  "items": [
    {
      ...
    }
  ],
  "license": "https://creativecommons.org/licenses/by/4.0/"
}

Have raised an issue to add this to the main spec: openactive/realtime-paged-data-exchange#34

[manzan46]

Added, also added back the photos and more info about the run and https://www.goodgym.org//getHappenings?afterTimestamp=2016-07-4%2017:46:49%20UTC&afterID=2139

[nickevansuk]

Fantastic, thanks!