Initial work on Nucleus parity merge

Packages/ohif-viewerbase/client/lib/classes/OHIFError.js

@@ -0,0 +1,14 @@
+// @TODO: improve this object
+/**
+ * Objects to be used to throw errors, specially
+ * in Trackers functions (afterFlush, Flush).
+ */
+export class OHIFError extends Error {
+
+    constructor(message) {
+      super();
+      this.message = message; 
+      this.stack = (new Error()).stack;
+      this.name = this.constructor.name;
+    }
+}