Merge pull request #68 from elgreco84/master

Added prerequisite module ids array to the CKIModule
Fixed Mantle parsing issue for Number to String conversion of Group/Course IDs
Merge pull request #69 from nlambson/master

Fixed Mantle parsing issue for Number to String conversion
Refactor user fetching. Add enrollments.
Merge pull request #70 from elgreco84/master

Added delete helpers to the CKIClient and implemented delete for files a...
Merge pull request #71 from jarsen/master

Refactor user fetching. Add enrollments.
Added error handling for deleting object from the api
Merge remote-tracking branch 'instructure/CanvasKit/master'