Revert "#49: putting date picker back in"

This reverts commit d5f1c035364f1d6a95bc4b841c3aa5c42f0d91b0.
Revert "#49: trying only ui-bootstrap date picker"

This reverts commit 4a57f351dc21369cae36a9dacaba80086a1169ff.
Revert "#49: putting ui-bootstrap date picker back in"

This reverts commit d61f59ec1f74902a7a067b4db2fbe97c44b2dcf3.
Revert "#49: set value of the date input"

This reverts commit a549b1b3aed23b759e9ec1de88427c88412bccd5.