feat(navigationbar): add NavigationBar plugin (#826)

* feat(navigationbar): add NavigationBar plugin

* fix(navigationbar) typo in chore

* Implement changes requested

* fix(): add return

* fix(docs): remove callback parameter

* Update navigationbar.ts

src/plugins/navigationbar.ts

@@ -0,0 +1,49 @@
+import { Cordova, Plugin } from './plugin';
+
+
+/**
+ * @name NavigationBar
+ * @description
+ * The NavigationBar plugin can you to hide and auto hide the android navigation bar. 
+ *
+ * @usage
+ * ```typescript
+ * import { NavigationBar } from 'ionic-native';
+ *
+ * let autoHide: boolean = true;
+ * NavigationBar.hide(autoHide);
+ * ```
+ */
+@Plugin({
+  name: 'NavigationBar',
+  plugin: 'cordova-plugin-navigationbar',
+  pluginRef: 'navigationbar',
+  repo: 'https://github.com/cranberrygame/cordova-plugin-navigationbar',
+  platforms: ['Android']
+})
+export class NavigationBar {
+
+  /**
+   * hide automatically (or not) the navigation bar.
+   * @param autohide {boolean}  
+   * @return {Promise<any>}
+   */
+  @Cordova({
+    callbackStyle: 'object',
+    successName: 'success',
+    errorName: 'failure'
+  })
+  static setUp(autohide?: boolean = false): Promise<any> { return; }
+
+  /**
+   * Hide the navigation bar. 
+   * @return {Promise<any>}
+   */
+  @Cordova({
+    callbackStyle: 'object',
+    successName: 'success',
+    errorName: 'failure'
+  })
+  static hideNavigationBar(): Promise<any> { return; }
+  
+}