hx-include attribute

• properly handles multiple select input referred to externally10ms ‣

  var values
  this.server.respondWith('Post', '/include', function(xhr) {
    values = getParameters(xhr)
    xhr.respond(204, {}, '')
  })
  make('<select id="multiSelect" name="multiSelect" multiple="multiple">' +
          '<option id="m1" value="m1">m1</option>' +
          '<option id="m2" value="m2">m2</option>' +
          '<option id="m3" value="m3">m3</option>' +
          '<option id="m4" value="m4">m4</option>' +
          '</select>')
  var div = make('<div hx-post="/include" hx-include="#multiSelect"></div>')
  div.click()
  this.server.respond()
  values.should.deep.equal({})
  byId('m1').selected = true
  div.click()
  this.server.respond()
  values.should.deep.equal({ multiSelect: 'm1' })
  byId('m1').selected = true
  byId('m3').selected = true
  div.click()
  this.server.respond()
  values.should.deep.equal({ multiSelect: ['m1', 'm3'] })