SEATTLE, Oct. 6, 2011 /PRNewswire via COMTEX/ –Zillow® /quotes/zigman/5930210/quotes/nls/z Z -2.32% , the leading real estate information marketplace, today announced the expansion of the Zillow iPhone® App, the most popular real estate app on the platform, by adding the rich experience of Zillow Mortgage Marketplace. Financing is an integral part of the home-buying process and …