LT-28: Scale overlay tool (work-in-progress)

LesionTracker/client/components/viewerMain/viewerMain.js

@@ -39,6 +39,20 @@ Template.viewerMain.helpers({
             iconClasses: 'fa fa-bars'
         });
 
+        buttonData.push({
+            id: 'scaleOverlayTool',
+            title: 'Scale Overlay',
+            classes: 'imageViewerCommand',
+            iconClasses: 'fa fa-arrows-h'
+        });
+
+        buttonData.push({
+            id: 'length',
+            title: 'Length Measurement',
+            classes: 'imageViewerTool',
+            iconClasses: 'fa fa-arrows-v'
+        });
+
         buttonData.push({
             id: 'lesion',
             title: 'Target Tool',