Merge pull request #241 from sheebans/master

added teach and study as separate api
CORE-304(Add One more field in Gooru Table)
Merge pull request #242 from saravanab/master

CORE-304(Add One more field in Gooru Table)
*Fixed 500 Issue while getting collection
Merge pull request #243 from cyrilraja/master

*Fixed 500 Issue while getting collection
*Added users count and itemCount in classpage
Fixed Null pointer exception In CollectionItem.
Merge pull request #245 from saravanab/master

Fixed Null pointer exception In CollectionItem.
Merge pull request #244 from cyrilraja/master

*Added users count and itemCount in classpage
Added ability to update the assignment status and added sorting support for asignment