change ref docs url format from 1_5 to v1.5

docs/resources-reference/v1.5/node_modules/optimist/example/line_count.js

@@ -0,0 +1,20 @@
+#!/usr/bin/env node
+var argv = require('optimist')
+    .usage('Count the lines in a file.\nUsage: $0')
+    .demand('f')
+    .alias('f', 'file')
+    .describe('f', 'Load a file')
+    .argv
+;
+
+var fs = require('fs');
+var s = fs.createReadStream(argv.file);
+
+var lines = 0;
+s.on('data', function (buf) {
+    lines += buf.toString().match(/\n/g).length;
+});
+
+s.on('end', function () {
+    console.log(lines);
+});