adding VOLUME command (#62)

* adding VOLUME command

* proper test project

* general fixes

* fixing project name

* fixing volume unit test

* fixing integration test

* adding tests

* adding util test

* fixing test

* actually create the volume mounted directory

* fix test

executor/cmd/root.go

@@ -146,6 +146,7 @@ func execute() error {
 			if err != nil {
 				return err
 			}
+			util.MoveVolumeWhitelistToWhitelist()
 			if contents == nil {
 				logrus.Info("No files were changed, appending empty layer to config.")
 				sourceImage.AppendConfigHistory(constants.Author, true)