To package missing modules

TO package missing modules,like below ,I open this pull 
Please review @jrbl @feanil @nedbat 

```shell
2014-12-05 10:10:39,858 ERROR 22467 [gunicorn.error] glogging.py:219 - Error handling request
Traceback (most recent call last):
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/gunicorn/workers/sync.py", line 126, in handle_request
    respiter = self.wsgi(environ, resp.start_response)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/handlers/wsgi.py", line 241, in __call__
    response = self.get_response(request)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 177, in get_response
    response = self.handle_uncaught_exception(request, resolver, sys.exc_info())
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 222, in handle_uncaught_exception
    if resolver.urlconf_module is None:
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/urlresolvers.py", line 342, in urlconf_module
    self._urlconf_module = import_module(self.urlconf_name)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/utils/importlib.py", line 35, in import_module
    __import__(name)
  File "/edx/app/edxapp/edx-platform/lms/urls.py", line 11, in <module>
    admin.autodiscover()
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/ratelimitbackend/admin.py", line 33, in autodiscover
    django_autodiscover()
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/contrib/admin/__init__.py", line 29, in autodiscover
    import_module('%s.admin' % app)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/utils/importlib.py", line 35, in import_module
    __import__(name)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/djcelery/admin.py", line 270, in <module>
    class PeriodicTaskAdmin(admin.ModelAdmin):
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/djcelery/admin.py", line 272, in PeriodicTaskAdmin
    form = periodic_task_form()
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/djcelery/admin.py", line 242, in periodic_task_form
    current_app.loader.import_default_modules()
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/djcelery/loaders.py", line 138, in import_default_modules
    self.autodiscover()
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/djcelery/loaders.py", line 141, in autodiscover
    self.task_modules.update(mod.__name__ for mod in autodiscover() or ())
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/djcelery/loaders.py", line 176, in autodiscover
    for app in settings.INSTALLED_APPS])
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/djcelery/loaders.py", line 195, in find_related_module
    return importlib.import_module('%s.%s' % (app, related_name))
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/openassessment/assessment/tasks.py", line 6, in <module>
    from .worker.training import train_classifiers, reschedule_training_tasks
ImportError: No module named worker.training
```