g1 dropdown `data` to support object also (in addition to array)

spec

[
  {
    attr: val_1_1,
    attr2: val_1_2
  },
  {
    attr: val_2_1,
    attr2: val_2_2
  },
  {
    attr: val_3_1,
    attr2: val_3_2
  },
  {
    attr: val_4_1,
    attr2: val_4_2
  },
  ..
  ..
]

<script>
  $('.container3').dropdown(
    { key: 'colors',
      data: [
        {
          value: 0,
          label: 'Hyderabad'
        },
        {
          value: 1,
          label: 'Delhi'
        },
        {
          value: 2,
          label: 'Mumbai'
        },
        {
          value: 3,
          label: 'Chennai'
        }
      ],
      target: '#'
    })
</script>