add aditional message keys

To order messages in different searchkeys, you can write:
var expected_E = {
	type: "TestType"
	, tags: [
		"Try"
		, "Tag"
	]
	, message: {a: 'old format', b:'inner json'}
	, myKey: "This is a test message"
      ,  foo: "in new format with additional keys"
	}
};

old message format is still suported:
var expected_E = {
	type: "TestType"
	, tags: [
		"Try"
		, "Tag"
	]
	, message: {
		myKey: "This is a test message"
		, foo: "bar"
	}
};