For bitbucket issue #2, tweak the admin settings for the Post model to reduce slow queries. Define our own queryset() method so we can control the select_related(), and not have it cascade from post to topics to forums to categories. Removed 'topic' from list_display because MySQL still sucked with 2 inner joins. Now it seems to be tolerable with only one join to User.

"""
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'),
)