Merge pull request #1257 from anilgooru/dev-branch

Fixed issue with contributors link.
Library:collection and quiz highlight issue rectified.
Merge branch 'dev-branch' of https://github.com/Gooru/Gooru-Web into dev-branch
Merge pull request #1258 from VinRudramurthy/dev-branch

Library:collection and quiz highlight issue rectified.
Fixed issue on not clickable on join button
Merge remote-tracking branch 'upstream/dev-branch' into dev-branch

* upstream/dev-branch:
  Library:collection and quiz highlight issue rectified.