Allow free input

[rtens]

I needed a traditional combo box that lets the user either choose from a select list or enter an arbitrary string. So I added an option freeInput to define the name and the value of the input field.

  $('.combobox').combobox({
    freeInput: {
     name:'foo', 
     value:'bar'
    }
  })

Thanks for the great widget =D

[CesarAV]

Excelent. Thank you!