added ability to drop a data criteria on another in the patient builder to set the start and end time
Merge pull request #9 from projecttacoma/builder-dc-on-dc
adds negations to patient builder data criteria editing
 * changes to view
 * changes to patient materiaization to fix string vs boolean
 * updated code to clean up string true on negations in the patient data criteria
Merge pull request #10 from projecttacoma/builder_dc_not_done