Added class on other peer production communities.

I added a class where students compare FOSS communities with other peer production communities such as Wikipedia. Each of the readings discusses aspects of peer production in the context of online content creation communities. The Kittur & Kraut reading discusses coordination and conflict management, the Stvilia et al. reading discusses quality control, and the Schroeder & Wagner reading discusses governance mechanisms. The class will compare these aspects of online content creation communities with their knowledge of how these mechanisms operate in FOSS communities.