By STELLA OBAMANU Apple has purchased Nigerian-born Chinedu Echeruo‘s HopStop.com application. With Google buying the Israel-based Waze map application for a reported $1.1 billion, it has been rumored that HopStop’s purchase was worth a similar amount. But thus far, Apple has not revealed the terms of the deal. As reported by the Wall Street Journal’s “All Things Digital” blog, HopStop empowers Apple’s map program …