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.
Merge pull request #1505 from mitraj/dev-branch

Update question image issue partially fixed.
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"
Fixed  Need video time to be consistant format
Merge pull request #1507 from nutan-gooru/dev-branch

Fixed  Need video time to be consistant format
"6.6 Parallel [Search] Standards are overlapping with description text in search fixed."
Merge pull request #1508 from sravanthi1/dev-branch

6.6 Parallel [Search] Standards are overlapping with description text in search Fixed.
Fixed Library only displays 15 Topics per Unit
Merge branch 'dev-branch' of https://github.com/Gooru/Gooru-Web into dev-branch
Fixed  [Library] Library only displays 15 Topics per Unit
"6.6 Parallel [My Classes] After inviting the student through mail, pending list is not displayed automatically, need to refresh the page Fixed"
Merge remote-tracking branch 'upstream/dev-branch' into dev-branch
Merge pull request #1510 from sravanthi1/dev-branch

6.6 Parallel [My Classes] After inviting the student through mail, pending list is not displayed automatically, need to refresh the page Fixed
Merge pull request #1509 from nutan-gooru/dev-branch

Fixed Library only displays 15 Topics per Unit
Unable to create a collection from my classes issue resolved
Merge branch 'dev-branch' of https://github.com/Gooru/Gooru-Web into dev-branch