Chances are, if you live in or near the city and are not fantastically wealthy, you probably have roommates. Maybe you live with friends, maybe with some folks you randomly found on craigslist and barely talk to, but sharing your living space with other people is a fact of life for most people under 30 in D.C. And in this kind of heat, any sort of odd personal odors emanating from your roommates’ bedrooms might…