Adapting header to the new structure

Packages/ohif-header/main.js

@@ -0,0 +1,11 @@
+import { OHIF } from 'meteor/ohif:core';
+import { Header } from './client/lib/header';
+
+/*
+ * Defines the base OHIF header object
+ */
+const header = new Header();
+
+OHIF.header = header;
+
+export { header };