Make Course form compatible with Backbone 1.0.0

In Backbone 0.9.9, the "request" event was added to Backbone.sync, so
the Collection#fetch override to trigger "request" is no longer needed.

In Backbone 1.0.0, the default updating mechanism after a fetch no
longer triggers "reset". Use the "sync" event instead.
Merge pull request #132 from va7map/canvas212-backbone_1_compat

Make Course form compatible with Backbone 1.0.0