Added Basic Pic Of the Day App Widget (#1523)

* Added Basic Pic Of the Day App Widget

* Added Java Lib for XML to JSON

* Added missing json library from xml to json

* Undone formatting

* Consolidate the networking libraries - drop volley in favor of OkHttp

* Extracted a few networking related items into a new Dagger module and finished the process of mocking the main component for tests.

* Refactoring to extract GpsCategoryModel and ensure single-responsibility-principle is maintained in CategoryApi.

* Updated PicOfDayAppWidget class to parse HTML

* fixed featured image back bug

* Localisation updates from https://translatewiki.net.

* Javadocs added

* Add option to set image as wallpaper (#1535)

* Add option to set image as wallpaper

* Added java docs

* Toast message on setting the wallpaper successfully

* Localisation updates from https://translatewiki.net.

* Add dependencies to com.android.support.test.rules and runner

Needed for ActivityTestRule used in SettingsActivityTest

* Added Basic Pic Of the Day App Widget

* Added Java Lib for XML to JSON

* Added missing json library from xml to json

* Undone formatting

* Updated PicOfDayAppWidget class to parse HTML

app/src/main/res/xml/pic_of_day_app_widget_info.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<appwidget-provider
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:initialKeyguardLayout="@layout/pic_of_day_app_widget"
+    android:initialLayout="@layout/pic_of_day_app_widget"
+    android:minHeight="250dp"
+    android:minWidth="250dp"
+    android:previewImage="@drawable/ic_launcher"
+    android:resizeMode="horizontal|vertical"
+    android:updatePeriodMillis="86400000"
+    android:widgetCategory="home_screen"></appwidget-provider>