Class: changing _super to look up the super

_super used to be a direct reference to the super class's implementation
of the function with the same name. However, if the super class's
prototype changes, that function reference doesn't change.
Controller: adding _view reference

Trending away from .View and toward ._view
Karma testing: switching back to cascading

Tests switch back to cascading by making use of build/all module.
Also, slightly more helpful error messages from requirejs.