Merge pull request #15 from jarsen/master

Add class-specific IDs to stream items.
Merge pull request #16 from jarsen/master

Fix ID properties in submission stream items.
Updates conversation endpoints to include attachments

Also implemented a method needed to archive messages.
Merge remote-tracking branch 'instructure/CanvasKit/ReactiveCocoa'
Merge pull request #17 from derrh/master

Updates conversation endpoints to include attachments
Merge pull request #18 from jarsen/master

Better document activity stream messages.
Merge pull request #19 from instructure/ReactiveCocoa

Reactive Cocoa
Fixes mantle parsing issue with discussion topics

Also added the path for a discussion topic and included in umbrella header.
Merge remote-tracking branch 'instructure/CanvasKit/master'
Merge pull request #20 from derrh/master

Adds discussion topic implementation
Added params to the course favorites api so it will get the course grade info as well.
Merge pull request #21 from elgreco84/master

Added params to the course favorites api so it will get the course grade...
Added support for Announcements which are basically Discussion Topics
Merge pull request #22 from nlambson/master

Added support for Announcements which are basically Discussion Topics
Header declaration for new Announcements fetch method
Merge pull request #23 from nlambson/master

Header declaration for new Announcements fetch method
Reactivate the client login process
Update sample code to work with the new reactive APIs