Merge pull request #81 from jarsen/master

Allow for Mac Dev
Merge pull request #85 from jarsen/master

Submissions
Add cookie for future update to canvas login
Merge pull request #86 from jarsen/master

Submission attachments and media comments
Merge pull request #87 from nlambson/master

Add cookie for future update to canvas login
Modify Canvas cookie logon
Added ability to fetch sections for a course
Merge remote-tracking branch 'instructure/CanvasKit/master'

Conflicts:
	CanvasKit.xcodeproj/project.pbxproj
Merge pull request #89 from elgreco84/master

Section support
Merge pull request #88 from nlambson/master

Modify Canvas cookie logon
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.