Even if you add values to the [celery] section in your
mediagoblin.ini they don't get passed in to the celery config
system because that section of the config file isn't passed into
the paste factory, and thus isn't passed along correctly either.

::

    def setup_celery_from_config(app_config, global_config,
                                 settings_module=DEFAULT_SETTINGS_MODULE,
                                 set_environ=True):

We'll have to probably use the generic config parser from
`http://bugs.foocorp.net/issues/297 <http://bugs.foocorp.net/issues/297>`_
and pass it into this function.

This matters in case users have any sort of custom parameters they
want to pass into mediagoblin.ini (such as CELERY\_ALWAYS\_EAGER =
True)

add a config file mediagoblin.globals to handle variables like
PAGINATION\_DEFAULT\_PER\_PAGE and
ATOM\_DEFAULT\_NR\_OF\_UPDATED\_ITEMS
keeps mediagoblin.ini cleaner and allows for server independent
settings

later users would be able to customise some of the parameters
values that differ from the default config, would be stored as user
dependent values in the database

It should be possible to edit the title, description, slug and
maybe other things.

In the long run, it might be needed to even replace the media. But
this is probably another item.