Pass month prop to navbarElement (#552)

* Pass current month to navbarElement

* Update docs

* Update changelog for #552

CHANGELOG.md

@@ -6,6 +6,7 @@ _The following changes are not released yet, but are on the master branch and wi
 
 * Added [`renderWeek`](http://react-day-picker.js.org/api/DayPicker`renderWeek) prop ([#497](https://github.com/gpbl/react-day-picker/issues/497) by [jenshandersson](https://github.com/jenshandersson))
 * Added [`onTodayButtonClick`](http://react-day-picker.js.org/api/DayPicker#onTodayButtonClick) prop ([#529](https://github.com/gpbl/react-day-picker/issues/529))
+* Added `month` prop to [`navbarElement`]((http://react-day-picker.js.org/api/DayPicker#navbarElement)) ([#552](https://github.com/gpbl/react-day-picker/issues/552))
 
 **Fixes**
 

docs/src/pages/api/DayPicker.js

@@ -341,34 +341,19 @@ export default () => (
       </p>
       <ul>
         <li>
-          className <code>String</code>
-        </li>
-        <li>
-          previousMonth <code>Date</code>
-        </li>
-        <li>
-          nextMonth <code>Date</code>
-        </li>
-        <li>
-          showPreviousButton <code>Boolean</code>
+          <code>month: Date</code> The currently displayed month
         </li>
         <li>
-          showNextButton <code>Boolean</code>
+          <code>previousMonth: Date</code>
         </li>
         <li>
-          onPreviousClick <code>() ⇒ undefined</code>
+          <code>nextMonth: Date</code>
         </li>
         <li>
-          onNextClick <code>() ⇒ undefined</code>
+          <code>onPreviousClick: () ⇒ undefined</code>
         </li>
         <li>
-          dir <code>String</code>
-        </li>
-        <li>
-          localeUtils <code>Object</code>
-        </li>
-        <li>
-          locale <code>String</code>
+          <code>onNextClick: () ⇒ undefined</code>
         </li>
       </ul>
       <h3>

src/DayPicker.js

@@ -453,6 +453,7 @@ export default class DayPicker extends Component {
     if (!canChangeMonth) return null;
 
     const props = {
+      month: this.state.month,
       classNames: this.props.classNames,
       className: this.props.classNames.navBar,
       nextMonth: this.getNextNavigableMonth(),