Merge pull request #167 from chandrasekharv/release-6.2

Added absolute top to the tooltip in the add button on resource page
Firefox: At organize level all the default gooru images for collections are broken. - Resolved
The Gooru default images folder for profile settings default images.
Merge pull request #169 from ssushma/release-6.2

Profile Gooru Default Images and collection edit default image issue resolved
When edit existing MA quesiton, user can not switch answer - Resolved
Merge pull request #171 from ssushma/release-6.2

When edit existing MA quesiton, user can not switch answer - Resolved
Default thumbnail issue fixed for empty url strings (For firefox)