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/client/components/timeoutCountdownDialog/timeoutCountdownDialog.html

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+<template name="timeoutCountdownDialog">
+    <div id="timeoutCountdownDialog">
+        <div class="dialogHeader">
+            <h5>Your session is about to expire.</h5>
+        </div>
+        <div class="dialogContent">
+            <p>You will be logged out in {{timeLeft}}.</p>
+        </div>
+    </div>
+</template>

Packages/ohif-user-management/client/components/timeoutCountdownDialog/timeoutCountdownDialog.js

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+Template.timeoutCountdownDialog.helpers({
+    timeLeft: function() {
+        var timeLeft = Session.get('countdownDialogLeftTime');
+        var suffix = timeLeft > 1 ? 'seconds': 'second';
+        return timeLeft + suffix;
+    }
+});
+
+Template.timeoutCountdownDialog.onRendered(function() {
+    // Show countdown dialog
+    var timeoutCountdownInterval;
+    $(document).on('TriggerOpenTimeoutCountdownDialog', function(e, leftTime) {
+        // Show modal dialog
+        timeoutCountdownInterval = setInterval(function() {
+            // Set countdownDialogLeftTime session
+            Session.set('countdownDialogLeftTime', --leftTime);
+
+            var dialog = $('#timeoutCountdownDialog');
+
+            // Show dialog
+            dialog.css('display', 'block');
+        }, 1000);
+
+    });
+
+    $(document).on('TriggerCloseTimeoutCountdownDialog', function() {
+        var dialog = $('#timeoutCountdownDialog');
+
+        // Close the dialog
+        dialog.css('display', 'none');
+
+        if (timeoutCountdownInterval) {
+            clearInterval(timeoutCountdownInterval);
+
+            // Remove reviewer info for the user
+            Meteor.call('removeUserFromReviewers', Meteor.userId());
+        }
+    });
+});

Packages/ohif-user-management/client/components/timeoutCountdownDialog/timeoutCountdownDialog.styl

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+#timeoutCountdownDialog
+  display: none
+  position: absolute
+  top: 0
+  bottom: 0
+  left: 0
+  right: 0
+  margin: auto
+  width: 20%
+  height: 15%
+  z-index: 100
+  border-radius: 5px
+  padding: 10px 20px 10px 20px
+  background-color: rgba(255,255,255,1)
+  outline: none