hx-boost attribute

• handles basic form post properly w/ explicit action10ms ‣

  this.server.respondWith('POST', '/test', 'Boosted')
  var div = make('<div hx-target="this"><form id="f1" action="/test" method="post"  hx-trigger="click" hx-boost="true"></form></div>')
  var form = byId('f1')
  form.click()
  this.server.respond()
  div.innerHTML.should.equal('Boosted')