Standardising editor's affiliation country format

[csarven]

Editor's affiliation country value is a string which makes it possible to have any value e.g., fullname of the country, ISO 3166-1-alpha-2 etc. It may be preferable to standardise on the format. It would mean that the values should be entered as ISO 3166-1-alpha-2 e.g., CA, or a wikipedia URL e.g., http://en.wikipedia.org/wiki/Canada (which we can map to dbpedia during transformation, like we do for the location of the event). Both can be mapped in any case.