Sort data criteria by start date/end date, re-sort on close
add "undefined" checkbox to data criteria edit
handle undefined end dates, give child views control over materialization

Setting an end date as undefined has the following effects:
* it disables the end date/time boxes
* it unsets the end_date field on the model (within the serialize event)
* it triggers a call to materialize

Materialize is now evented. Child views of the parent builder register with the parent builder, so it can listen to them. When they trigger a bonnie:materialize event, the patient builder kicks off a call to materialize.
Merge branch 'sort_patient_data_criteria' into develop