Bugfix: placeholder data-input must hold a reference to input

By mistake, placeholder element was saving a reference to itself as data-input instead of a reference to the input element.
Thatas affect only to the click handler on autocomplete that auto-focus its related input.
Merge pull request #43 from IagoSRL/master

Bugfix: placeholder element must save a reference to the input element in data-input, not to itself.