Merge pull request #76 from alxdarksage/develop

Updates to recent bridge changes
Merge pull request #77 from alxdarksage/develop

Build breaker?
Support now for deleting rows in the trackers, from the table or index view.
A number of small bug fixes
Merge branch 'develop' of https://github.com/Sage-Bionetworks/Bridge into develop
Switched to use of ParticipantDataValue, removes some object --> string conversion logic
First part of a refactor to use the ParticipantDataRow/Value objects (not converting them until display, ultimately) and consistently formatting/converting tracker data using the FormElement converters.