Query Parameters should not need x=y format

[PandaWood]

I'm not sure this is debatable (though URI.js does it) that adding query string parameters can just have a single value - for example "&link" and not necessarily "&link=true"

If you pass only one arg to jsUri addQueryParameter you get the worst possible outcome: "&link="
But I this should produce just "&link"

new Uri(url).addQueryParam('link').toString()