Annotation Widget Proposal - WebAPI

Overview

In order to improve ATLAS/WebAPI's ability to validate a cohort, I've implemented an annotation widget. This annotation widget allows a user in ATLAS to perform manual chart review, i.e. answer a set of questions (or multiple sets) regarding a subject in a cohort. The results of the chart review are persisted for later processing. Here is a picture of the widget (sidebar on right side):

The widget needs several tables added to the webapi schema as well as new CRUD endpoints in order to operate. The proposed schema is depicted in the following diagram:

Note: @pavgra, @chrisknoll, @anthonysena we are no longer proposing adding a separate annotation_author table, instead the annotation.user_id attribute will be FK to shiro or null (i.e. anonymous) for non-shiro installations.

If you'd like to view the accompanying front-end/knockout.js design proposal, go here.

Also, can the appropriate person grant me permission to push a branch to the this repo so the widget's endpoints and supporting schema can be further reviewed?