Bump to 0.4.8

Fixes SIS-416

Change-Id: I3b0c10738e79f88d98dc39eb17a46680ae7ef51a
Update to 0.4.9

Update to latest Canvas API docs

Refs SIS-432

Change-Id: I3a27a01590fcbf431646e858c6b1b966089a7a77
Update to latest Canvas docs; bump to 0.5

Fixes SIS-552

Change-Id: Ia63dd5b3dfe779f0b85df773ac060f8e4486fa3a