Fetch credentials arg from CLI

src/node/utils/Cli.js

@@ -34,5 +34,10 @@ for ( var i = 0; i < argv.length; i++ ) {
     exports.argv.settings = arg;
   }
 
+  // Override location of credentials.json file
+  if ( prevArg == '--credentials' ) {
+    exports.argv.credentials = arg;
+  }
+
   prevArg = arg;
 }