Description:

The worker generator creates stubs for a new BackgrounDRb worker.

The generator takes a worker name as its argument.  The worker name may be
given in CamelCase or under_score and should not be suffixed with 'Worker'.

The generator creates a worker class in lib/workers and a test suite in
test/unit.

Example:

./script/generate backgroundrb:worker Tail

This will create an Tail worker:
    Model:      lib/workers/tail_worker.rb
    Test:       test/unit/tail_worker_test.rb