获取iOS应用的版本号，和bulid值

版本号：[[[NSBundlemainBundle]infoDictionary]objectForKey:@"CFBundleShortVersionString"] 或者[[NSBundlemainBundle]objectForInfoDictionaryKey:@"CFBundleShortVersionString"];

bulid值：[[[NSBundlemainBundle]infoDictionary]objectForKey:@"CFBundleVersion"]