Fixed: null pointer exception while closing when previous token is null.
Fixed: null pointer exception while showing creator name.
Fixed UI issue over lap on search result with OER and Mobile friendly image.
removed extra space at the end.
Fixed drive listing content issue.
Removed clearing cookies when user logouts from gooru.
Merge remote-tracking branch 'upstream/dev-branch' into dev-branch

* upstream/dev-branch:
  Assign collection to class - Resolved
Fixed issue playing in preview play instead of collection play.
Fixed issue with Library Navigation.
Merge remote-tracking branch 'upstream/dev-branch' into dev-branch

* upstream/dev-branch:
  Displaying Quiz in library view issue has been fixed.
Merge pull request #1136 from anilgooru/dev-branch

Bug fixes.