Fix ESLint errors in bin/pegjs

Fix the following errors:

   12:3  error  Unexpected console statement       no-console
   16:3  error  Unexpected console statement       no-console
   17:3  error  Unexpected console statement       no-console
   18:3  error  Unexpected console statement       no-console
   19:3  error  Unexpected console statement       no-console
   20:3  error  Unexpected console statement       no-console
   21:3  error  Unexpected console statement       no-console
   22:3  error  Unexpected console statement       no-console
   23:3  error  Unexpected console statement       no-console
   24:3  error  Unexpected console statement       no-console
   25:3  error  Unexpected console statement       no-console
   26:3  error  Unexpected console statement       no-console
   27:3  error  Unexpected console statement       no-console
   28:3  error  Unexpected console statement       no-console
   29:3  error  Unexpected console statement       no-console
   30:3  error  Unexpected console statement       no-console
   31:3  error  Unexpected console statement       no-console
   32:3  error  Unexpected console statement       no-console
   33:3  error  Unexpected console statement       no-console
   34:3  error  Unexpected console statement       no-console
   35:3  error  Unexpected console statement       no-console
   36:3  error  Unexpected console statement       no-console
   37:3  error  Unexpected console statement       no-console
   38:3  error  Unexpected console statement       no-console
   39:3  error  Unexpected console statement       no-console
   40:3  error  Unexpected console statement       no-console
   41:3  error  Unexpected console statement       no-console
   42:3  error  Unexpected console statement       no-console
   43:3  error  Unexpected console statement       no-console
   44:3  error  Unexpected console statement       no-console
   56:3  error  Unexpected console statement       no-console
  232:9  error  "inputStream" is already defined   no-redeclare
  240:9  error  "outputStream" is already defined  no-redeclare

bin/pegjs

@@ -1,5 +1,7 @@
 #!/usr/bin/env node
 
+/* eslint no-console: 0 */
+
 "use strict";
 
 var fs   = require("fs");
@@ -219,17 +221,20 @@ while (args.length > 0 && isOption(args[0])) {
   nextArg();
 }
 
+var inputStream;
+var outputStream;
+
 switch (args.length) {
   case 0:
     process.stdin.resume();
-    var inputStream = process.stdin;
-    var outputStream = process.stdout;
+    inputStream = process.stdin;
+    outputStream = process.stdout;
     break;
 
   case 1:
   case 2:
     var inputFile = args[0];
-    var inputStream = fs.createReadStream(inputFile);
+    inputStream = fs.createReadStream(inputFile);
     inputStream.on("error", function() {
       abort("Can't read from file \"" + inputFile + "\".");
     });
@@ -237,7 +242,7 @@ switch (args.length) {
     var outputFile = args.length === 1
       ? args[0].replace(/\.[^.]*$/, ".js")
       : args[1];
-    var outputStream = fs.createWriteStream(outputFile);
+    outputStream = fs.createWriteStream(outputFile);
     outputStream.on("error", function() {
       abort("Can't write to file \"" + outputFile + "\".");
     });