Convert date selects to text fields

www.agileplannerapp.com/boards/173808/cards/4294

as per GOV.UK elements suggestion, the date fields
should be text inputs:

http://govuk-elements.herokuapp.com/examples/forms
wqConvert date time selects to text fields

www.agileplannerapp.com/boards/173808/cards/4294
Update integration tests to use date text fields