Merge gamification branch with master (#1752)

* Quiz  (#1629)

*  Layout inflated

*  Layout for mcq added

*  Inflated Basic Layout

*  Implemented basic flow

*  Added the basic implementation pf score

*  Added the result layout

*  Added the result layout

*  Added functionality to set result

*  Changed the launcher intent to Quiz Activity for testing purpose

*  Explanations of answers added

*  Improved the layout of quiz result a bit

*  Fixed some minor issues

*  Fixed build issues

* Api Added and basic structure for calling implemented

* Added intents

*  Added the title

*  Fixed image error and improved quality of pr

*  Made separate class for checking quiz

*  Added counter

* Implemented back and next for quiz result

*  Added back functionality to quiz

*  Added progressBar

*  Fixed bugs

*  Improved code quality

*  Imporved code Quality

*  Updated strings

*  Added share screenshot function

*  Added checks and improved UI

*  Removed unused string

*  Removed unused string

* Adding checks and improving code quality

* Changed string

* Improved code quality

* Update strings.xml

* Update MediaWikiApi.java

* Fix build

app/src/main/res/layout/image_alert_layout.xml

@@ -16,6 +16,6 @@
         android:layout_height="wrap_content"
         android:id="@+id/alert_text"
         android:layout_marginRight="@dimen/activity_margin_horizontal"
-        android:layout_marginLeft="@dimen/activity_margin_horizontal"/>
+        android:layout_marginLeft="@dimen/activity_margin_horizontal" />
 
 </LinearLayout>