Hiding the Thumbnail URL tag from the info tab in resorce and preview player.
Merge pull request #162 from ssushma/release-6.2

Hiding the Thumbnail URL tag from the info tab in resource player
Recent changes for Teacher tip disappears once the user shifts tab and come back to share tab - this issue is resolved.
Merge pull request #163 from ssushma/release-6.2

Recent changes for Teacher tip disappears once the user shifts tab and c...
Merge pull request #164 from Gooru/release-6.2

Teacher Tip Not reflecting new changes and Thumbnail URL fields are hidden