slider and knob with different behaviour

[victordiaz]

• The slider moves exactly to the place you touch,
• Knob needs to touch and then move

I think the second should be the default for both view types but is nicer to have the option to change

[victordiaz]

The mode() method can change now the behaviour

var slider = ui.addSlider(0.1, 0.5, 0.8, 0.2).mode('drag').onChange(function (e) {
  console.log(e)
})