add qualifier-order, check for missing keys in JsonResultComparer
just formatting
Merge remote-tracking branch 'origin/master' into
add_qualifiers-order_to_json

Conflicts:
	wdtk-datamodel/src/test/resources/ItemDocument.json
Merge pull request #61 from Wikidata/add_qualifiers-order_to_json

Add qualifiers order to json
Merge remote-tracking branch 'origin/master' into json-serializer
add qualifiers-order attribute to ItemDocumentEntry.txt