Retrying to instantiate a browser when getting error status 13 from wd
Retrying to intialize the browser when a non JSON response is received with data indicating that the run is not in progress
Added a retry threshold of three (3) to retrying on errors indicating that environments can't be instantiated so that we won't end up looping forever by mistake.
Merge pull request #50 from rase-/error-workaround

Retrying to instantiate a browser when getting error status 13 from wd