add UNSUPPORTED_API_VERSION to list of known authentication errors
add UNSUPPORTED_API_VERSION to list of known authentication errors

tectronics/forceworkbench,Letractively/forceworkbench,google-code-export/forceworkbench,robbyrob42/forceworkbench,google-code-export/forceworkbench,Letractively/forceworkbench,gmathrubootham/forceworkbench,ganesh-sfdc/forceworkbench,robbyrob42/forceworkbench,Letractively/forceworkbench,tectronics/forceworkbench,google-code-export/forceworkbench,ganesh-sfdc/forceworkbench,gmathrubootham/forceworkbench,ganesh-sfdc/forceworkbench,gmathrubootham/forceworkbench,ganesh-sfdc/forceworkbench,robbyrob42/forceworkbench,gmathrubootham/forceworkbench,tectronics/forceworkbench