Add needs_grading_count flag when fetching assignments

There's already a property for this on the model, but it
will never have a value because we don't fetch it.
add needsGradingCount to CKICourse

the property was there, but the mapping wasn't hooked
up so you were never getting any values
Merge remote-tracking branch 'instructure/CanvasKit/master'
refactor CKIAssignment
fixing up rubrics
add to umbrella header, clean up
make assignment groups return assignments
actually use params from last commit
Changes to Admin forced Canvas login
minor adjustments to models

rename a few properties, adjust types, etc.
Merge pull request #102 from elgreco84/master

Added updated polling APIs
added jsonapi format support
Merge pull request #103 from instructure/jsonapi-support

added jsonapi format support
implement the jsonAPIKey version of the method

also keeps the version declared in the .h file present
Merge pull request #104 from derrh/master

implement the jsonAPIKey version of the method
updated the publish api endpoint
Merge pull request #105 from instructure/jsonapi-support

updated the publish api endpoint
Transform courseID to string
Merge pull request #106 from derrh/master

Making section's courseID a string
Merge pull request #107 from derrh/master

convert courseID to string on CKISection