Don't do stale element test on creating JSON response after a scroll request.

The check can scroll views, which is interfering with legitimate
attempts to scroll the UI in ios-driver.
Merge pull request #331 from iamleeg/no-scroll-on-cache-lookup

Don't do stale element test on creating JSON response after a scroll request
ios-logging.properties installs a FileHandler on the root logger which outputs ALL events to ios-driver.log #322
- Adding a configuration to allow the user to skip ios-driver default logging configuration
minor fixes to ios-driver