In the summer of 2013, Apple bought HopStop, a popular navigation app, in a deal rumored to cost about $1 billion. Now, just a little more than two years after that acquisition, Apple (NASDAQ: AAPL) will shut down the New York-based app in October, perhaps signaling a greater push for its Apple Maps product. Already, Apple had pulled HopStop support for Android devices, Fortune explained, and with Apple recently announcing upgrades to its maps app, including transit directions in 10 world cities,...