Added support for Announcements which are basically Discussion Topics
Header declaration for new Announcements fetch method
Reactivate the client login process
Update sample code to work with the new reactive APIs
Update README.md

update the readme's info on login.
Add header to load client from keychain.
Adds course permissions update endpoint
Added the path to files and folders. Added some missing properties to files
Merge remote-tracking branch 'instructure/CanvasKit/master'

Conflicts:
	CanvasKit/Networking/CKIClient.m
Merge pull request #29 from elgreco84/master

Files