fix Issue 394: 	ZIP request downloads being treated as CSV/XML
fix Issue 394: 	ZIP request downloads being treated as CSV/XML

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