CLOSED - task 330: Make default logo setting in app class
https://github.com/DigitalCampus/oppia-mobile-android/issues/issue/330
Merge remote-tracking branch 'upstream'

Conflicts:
	src/org/digitalcampus/oppia/activity/CourseActivity.java
	src/org/digitalcampus/oppia/adapter/SearchResultsListAdapter.java
	src/org/digitalcampus/oppia/utils/lazylist/ImageLoader.java