Merge pull request #11 from lukeis/master

find elements should return an empty list
refactored all findElements Methods to return an empty JSONArray if nothing was found. Behavior is now the same like in FirefoxDriver.
refactored sysouts to use the selendroid logger.
refactored all findElements Methods to return an empty JSONArray if nothing was found. Behavior is now the same like in FirefoxDriver.
should return status code 10 (stale reference) for element id's not found in the cache