Merge pull request #269 from skpcharles/master

added active field in login API response
included the grade serialization
provided support for course level fetching in library
provided support for course level fetching in library
Merge pull request #270 from sheebans/master

provided support for course level fetching in library
added fix for assignment count issue
Merge pull request #271 from sheebans/master

added fix for assignment count issue
added fix for null pointer expection
Merge pull request #272 from sheebans/master

added fix for null pointer expection
added fix for null pointer expection
added fix for null pointer expection
Merge pull request #273 from sheebans/master

added fix for null pointer expection
added fix for null pointer expection
Merge pull request #274 from sheebans/master

added fix for null pointer expection
Fixed assignment duplicate sequence issue
Merge pull request #275 from sheebans/master

Fixed assignment duplicate sequence issue
Added update support for active field in user object