Core htmx API test

• should remove class properly2ms ‣

  var div = make('<div></div>')
  htmx.addClass(div, 'foo')
  div.classList.contains('foo').should.equal(true)
  htmx.removeClass(div, 'foo')
  div.classList.contains('foo').should.equal(false)

• should remove class properly w/ selector0ms ‣

  var div = make("<div id='div1'></div>")
  htmx.addClass(div, 'foo')
  div.classList.contains('foo').should.equal(true)
  htmx.removeClass('#div1', 'foo')
  div.classList.contains('foo').should.equal(false)