Merge pull request #372 from PurnimaGS/master

Rover-126 Implemented code for Google Oauth login flow
*Fixed gooruUId issue for user.login event
Merge remote-tracking branch 'gooru/master'
Added collectionType filed in folder APIs
Merge pull request #373 from skpcharles/master

Added collectionType filed in folder APIs
Added index API support in collection copy
Merge pull request #374 from skpcharles/master

Added index API support in collection copy
Fixed null pointer issue while collection copy
Merge pull request #376 from skpcharles/master

Fixed null pointer issue while collection copy
Removed the unused class/package imports
Removed the unused variables or methods
Merge pull request #378 from sheebans/master

Removed the unused class/package/variables imports
Excluded the empty or null value due date - #DO-4666
Excluded the empty or null value due date - #DO-4666
Fixed  classpage-assignment issue while doing filter
Merge pull request #379 from sheebans/master

Excluded the empty or null value due date - #DO-4666
Provided support to fetch collection and quiz tagged collections
Merge pull request #375 from cyrilraja/master

*Fixed gooruUId issue for user.login event
Merge pull request #380 from sheebans/master

Provided support to fetch collection and quiz tagged collections
Provided support to get the number of pages