added cityblogs app, /cityblogs/orgs/:slug endpoint.
added feedparser to requirements.minimal.txt.
show related blog posts on org detail page.
cache cityblog feeds for 3m instead of 1h.
added tests for cityblogs.
show nicer date format in cityblogs.
mention hive city in cityblogs org posts panel.
fade-in related blog posts panel.
allow city, multi-city editors to add/change/del CityBlogs.
added some docstrings.
actually, just make the cityblog an inline admin on City.
decouple initgroups.py from cityblogs.
Merge pull request #47 from toolness/cityblogs

[WIP] Show related Hive blog posts on organization detail pages