Set TopBar default options

lib/android/app/src/main/java/com/reactnativenavigation/parse/TopBarOptions.java

         options.textColor = ColorParser.parse(json, "textColor");
         options.textFontSize = FractionParser.parse(json, "textFontSize");
         options.textFontFamily = typefaceManager.getTypeFace(json.optString("textFontFamily", ""));
-        options.hidden = Options.BooleanOptions.parse(json.optString("hidden"));
-        options.animateHide = Options.BooleanOptions.parse(json.optString("animateHide"));
+        options.hidden = Options.BooleanOptions.parse(json.optString("hidden", "false"));
+        options.animateHide = Options.BooleanOptions.parse(json.optString("animateHide", "true"));
         options.hideOnScroll = Options.BooleanOptions.parse(json.optString("hideOnScroll"));
         options.drawBehind = Options.BooleanOptions.parse(json.optString("drawBehind"));
         options.rightButtons = Button.parseJsonArray(json.optJSONArray("rightButtons"));
     public Color textColor = new NullColor();
     public Fraction textFontSize = new NullFraction();
     @Nullable public Typeface textFontFamily;
-    public Options.BooleanOptions hidden = Options.BooleanOptions.NoValue;
-    public Options.BooleanOptions animateHide = Options.BooleanOptions.NoValue;
+    public Options.BooleanOptions hidden = Options.BooleanOptions.False;
+    public Options.BooleanOptions animateHide = Options.BooleanOptions.True;
     public Options.BooleanOptions hideOnScroll = Options.BooleanOptions.NoValue;
     public Options.BooleanOptions drawBehind = Options.BooleanOptions.NoValue;
     public ArrayList<Button> leftButtons;

lib/android/app/src/test/java/com/reactnativenavigation/parse/OptionsTest.java

         Options uut = new Options();
         assertThat(uut.topBarOptions.title.get("")).isEmpty();
     }
+
+    @Test
+    public void topBar_defaultOptions() throws Exception {
+        Options uut = new Options();
+        assertThat(uut.topBarOptions.hidden).isEqualTo(Options.BooleanOptions.False);
+        assertThat(uut.topBarOptions.animateHide).isEqualTo(Options.BooleanOptions.True);
+    }
 }