Merge branch '2.0' into layout-refactor

# Conflicts:
#	src/components/tabs/test/advanced/index.ts

src/components/nav/nav-controller.ts

@@ -1752,6 +1752,13 @@ export class NavController extends Ion {
     return this._views.length;
   }
 
+  /**
+   * @private
+   */
+  isSwipeBackEnabled(): boolean {
+    return this._sbEnabled;
+  }
+
   /**
    * Returns the root `NavController`.
    * @returns {NavController}