Merge pull request #117 from colemanw/master

VOL-17 - set volunteer_role_id based on need, also fix duration/time_completed pair
VOL-17 - Fix Volunteer report to retrieve volunteer roles from activity custom field.
Merge pull request #118 from davecivicrm/VOL-17a

VOL-17 - Fix Volunteer report to retrieve volunteer roles from activity ...
Need BAO - Handle deleting a need