Prevent spamming of the resource suggestion form

[e2jk]

On 6 October 2012, 11445 resources were "suggested", containing only spam.

I've suppressed them using this command:

$ python manage.py shell
>>> from flosstalks_app.models import Resource
>>> for r in Resource.objects.filter(status="SG"):
...    r.delete()

If this happens again, we'll need to take some preventive measures. Question is what? Captcha, removing the whole form, etc?

[e2jk]

New management command to vacuum the database after deleting all the spam, added in 659e0cd:

$ python manage.py vacuum