For #95. You can now make posts with no text in the body if you have attachments. And now if you create a new topic with an attachment, and the POST fails (say you forgot the topic title), we will now re-attach attachments. Also fixed a bug in the smiley code that would arise if it was asked to markup an empty string.

"""
Urls for the core application.
"""
from django.conf.urls.defaults import *

urlpatterns = patterns('core.views',
    url(r'^markdown_help/$', 'markdown_help', name='core-markdown_help'),
    url(r'^ajax/users/$', 'ajax_users', name='core-ajax_users'),
)