fix(UISref/UISrefActive): make proptypes non-required: parentUIView, addStateInfoToParentActive

Closes #173

Author: christopherthielen

src/components/UISref.tsx

@@ -32,8 +32,8 @@ class Sref extends Component<UISrefProps, any> {
   deregister: Function;
   static propTypes = {
     router: PropTypes.object.isRequired,
-    parentUIView: PropTypes.object.isRequired,
-    addStateInfoToParentActive: PropTypes.func.isRequired,
+    parentUIView: PropTypes.object,
+    addStateInfoToParentActive: PropTypes.func,
     children: PropTypes.element.isRequired,
     to: PropTypes.string.isRequired,
     params: PropTypes.object,

src/components/UISrefActive.tsx

@@ -45,7 +45,7 @@ class SrefActive extends Component<UISrefActiveProps, any> {
   deregister: Function;
 
   static propTypes = {
-    parentUIView: PropTypes.object.isRequired,
+    parentUIView: PropTypes.object,
     router: PropTypes.object.isRequired,
     class: PropTypes.string.isRequired,
     children: PropTypes.element.isRequired,