Work on refactoring measurements out of Lesion Tracker package

- Removed AssociatedStudies Collection
- Measurement API is generated from configuration files
- Data exchange methods are defined in configuration

Packages/ohif-user-management/server/createDemoUser.js

@@ -0,0 +1,39 @@
+import { Accounts } from 'meteor/accounts-base';
+
+
+Meteor.startup(function() {
+    const options = {
+        email: 'demo@ohif.org',
+        password: '12345678aA*',
+        profile: {
+            fullName: 'Demo User'
+        }
+    };
+
+    createDemoUser = function() {
+        const user = Meteor.users.findOne({
+            emails: {
+                $elemMatch: {
+                    address: 'demo@ohif.org'
+                }
+            }
+        });
+        if (user) {
+            return;
+        }
+        console.log('create user!');
+
+        // Create user
+        const userId = Accounts.createUser(options);
+
+        if (!userId) {
+            console.log('Demo user cannot be created');
+            return;
+        }
+    };
+
+    // Create demo user
+    createDemoUser();
+
+});
+