Fix some OHIF undefined imports which may have been throwing errors in #78

Packages/ohif-viewerbase/client/components/viewer/toolContextMenu/toolContextMenu.js

@@ -1,5 +1,6 @@
 import { Template } from 'meteor/templating';
 import { ReactiveVar } from 'meteor/reactive-var';
+import { OHIF } from 'meteor/ohif:core';
 import { toolManager } from '../../../lib/toolManager';
 
 const toolTypes = ['length', 'simpleAngle', 'probe', 'ellipticalRoi', 'rectangleRoi', 'arrowAnnotate'];