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
Added support for basic HTTP authentication
Added localization support for HTTP Authentication fix
Merge pull request #98 from nlambson/master

Added support for basic HTTP authentication
Updated podspec for new tagged release
Merge pull request #99 from nlambson/master

Updated podspec for new tagged release
Adding support for outcomes
make assignment groups return assignments
actually use params from last commit
Changing id's to strings and removing unnecessary method
Merge pull request #100 from bpluim/MBL-2187_Add-Outcomes

Adding support for outcomes
minor adjustments to models

rename a few properties, adjust types, etc.
Remove unnecessary mappings from CKIEnrollment
Merge pull request #101 from bpluim/MBL-2187_Add-Outcomes

Remove unnecessary mappings from CKIEnrollment
updated polling networking