Add class UserContext

src/core/UserContext.js

@@ -0,0 +1,18 @@
+getJasmineRequireObj().UserContext = function(j$) {
+  function UserContext() {
+  }
+
+  UserContext.fromExisting = function(oldContext) {
+    var context = new UserContext();
+
+    for (var prop in oldContext) {
+      if (oldContext.hasOwnProperty(prop)) {
+        context[prop] = oldContext[prop];
+      }
+    }
+
+    return context;
+  };
+
+  return  UserContext;
+};