add picker for date datetime and time formtype

In your form builder

```
        $builder
            ->add('a', null, array(
                'widget' => 'single_text',
                'datepicker' => true,
            ))
            ->add('b', null, array(
                'widget' => 'single_text',
                'datetimepicker' => true,
            ))
            ->add('c', null, array(
                'widget' => 'single_text',
                'timepicker' => true,
            ))
        ;
```

In your template (french configuration)

```

{% block foot_script_assetic %}

    {{ parent() }}

    {% javascripts
    '@MopaBootstrapBundle/Resources/public/bootstrap-datetimepicker/js/locales/bootstrap-datetimepicker.fr.js'
    %}
    <script type="text/javascript" src="{{ asset_url }}"></script>
    {% endjavascripts %}

    <script>
        $(function(){

            $('[data-provider="datepicker"]').datetimepicker({
                autoclose: true,
                format: 'dd/mm/yyyy',
                language: 'fr',
                minView: 'month',
                pickerPosition: 'bottom-left',
                todayBtn: true,
                startView: 'month'
            });

            $('[data-provider="datetimepicker"]').datetimepicker({
                autoclose: true,
                format: 'dd/mm/yyyy hh:ii',
                language: 'fr',
                pickerPosition: 'bottom-left',
                todayBtn: true
            });

            $('[data-provider="timepicker"]').datetimepicker({
                autoclose: true,
                format: 'hh:ii',
                formatViewType: 'time',
                maxView: 'day',
                minView: 'hour',
                pickerPosition: 'bottom-left',
                startView: 'day'
            });

            // Restore value from hidden input
            $('input[type=hidden]', '.date').each(function(){
                if($(this).val()) {
                    $(this).parent().datetimepicker('setValue');
                }
            });

        });
    </script>

{% endblock %}

```