Fix issue with pre loaded courses not having the priority set
CLOSED - task 343: Change to use https by default
https://github.com/DigitalCampus/oppia-mobile-android/issues/issue/343
testing adding user agent to download request
OPEN - task 348: Add username (as read only) to the settings page
https://github.com/DigitalCampus/oppia-mobile-android/issues/issue/348
OPEN - task 345: Make the display of the course description optional
https://github.com/DigitalCampus/oppia-mobile-android/issues/issue/345
Add setting option to select text size in webviews
Merge branch 'master' into v4.1.0