Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge pull request #71 from hhoang/master

Group Category support for canvasAPI
Merge pull request #72 from hhoang/master

Added support for users in GroupsAPI
Merge remote-tracking branch 'upstream/master'
Added async tasks to handle caching
Added a check and fixes for model object that are not serializable
Merge pull request #73 from matthewrice345/master

Added async tasks for caching
Added null checks for the context on date formatting
Merge pull request #74 from matthewrice345/master

Added null checks for the context on date formatting
Fix callback for logging in.
Merge pull request #75 from bradylarson/master

Fix callback for logging in.