removed unused import.
Merge remote-tracking branch 'upstream/dev-branch' into dev-branch

* upstream/dev-branch:
  removed depricated api code
  Fixed Some Video Start time & Stop Time are not correct + Extra Video Time line shows up
  Studnet list size has been increased from 10 to 20
  written condition to call unwanted api
  Changed the session expiry time to 24 hrs.
  get emailid outside of condition
  Session Expiry: Implemented and Ratings- handled updating review count when deleted only ratings.
  If collection played from study or teach, share url has been modified.
removed un used imports.
Fixed : Need lower case for 2 words "Start creating collections"
Merge remote-tracking branch 'upstream/dev-branch' into dev-branch

* upstream/dev-branch:
  "Update question image issue partially fixed."
  removed unwanted api call
  "save button ui issue and update question image issue resolved."
  6.6 [Search - Remix] Add popup wouldn't close when added collection from searcch to mycollections fixed
  Library: Added meta data for "Valvarde library "
  library loading issue fixed
Merge pull request #1506 from anilgooru/dev-branch

Fixed : Need lower case for 2 words "Start creating collections"