T233 DateTime Picker - Added Datetimepicker in seedset form. closes #223

[rajatvij]

@lwrubel I have added Datetime picker on Seedset form screens. We can configure it a bit more by adding attr in forms.py
Eg.,
'start_date': DateTimeWidget(usel10n=True, bootstrap_version=3),

can be changed to
'start_date': DateTimeWidget(attrs={'id':"yourdatetimeid"}, usel10n=True, bootstrap_version=3),

id values:
'0' for the hour view
'1' for the day view
'2' for month view (the default)
'3' for the 12-month overview
'4' for the 10-year overview. Useful for date-of-birth datetimepickers.

Please refer https://github.com/asaglimbeni/django-datetime-widget for more.

Right now we are using default month view

Let me know if you require any change in this.

[lwrubel]

I think month default view is good to start.

To preserve ability to manually edit dates/times in the field, as described here, request you add to the widget:
attrs={'data-readonly': 'false'}

And beyond that, looks ready to squash and merge.

[rajatvij]

@lwrubel Corrected date field as per your comment above. Please check and let me know if you find any other issues with it.