OPEN - task 277: Login/Register - merge into one activity with fragments 
https://github.com/DigitalCampus/oppia-mobile-android/issues/issue/277
OPEN - task 277: Login/Register - merge into one activity with fragments 
https://github.com/DigitalCampus/oppia-mobile-android/issues/issue/277
OPEN - task 277: Login/Register - merge into one activity with fragments 
https://github.com/DigitalCampus/oppia-mobile-android/issues/issue/277