Fix Asset.mediaType/Asset.format confusion
Joinup wants more AssetDistribution properties

The license and creation date seem to be mandatory for Joinup.
egif: Add issued and license on AssetDistribution
Text properties must have an English version
Joinup wants a title for each AssetDistribution
forumstandaardisatie: Add missing properties

Also change the repository URI to match what is already on Joinup.
egif: Add AssetDistribution.title on static assets
xsd:dateTime values must have a timezone
w3c: Fix dates