Added entities generator script

support/entities.js

@@ -0,0 +1,51 @@
+#!/usr/bin/env node
+
+//
+// Markdown entities generator (from html5 entities)
+//
+'use strict';
+
+/*eslint no-console:0*/
+
+
+var http = require('http');
+
+function codeToUni(code) {
+  var result = code.toString(16).toUpperCase();
+  while (result.length < 4) { result = '0' + result; }
+  return '\\u' + result;
+}
+
+function strToUni(str) {
+  var result = codeToUni(str.charCodeAt(0));
+  if (str.length > 1) {
+    result += codeToUni(str.charCodeAt(1));
+  }
+  return result;
+}
+
+http.get('http://www.w3.org/TR/html5/entities.json', function (res) {
+  var body = '';
+  res.on('data', function(chunk) {
+    body += chunk;
+  });
+  res.on('end', function() {
+    var entities = JSON.parse(body);
+    var out = {};
+
+    Object.keys(entities).forEach(function (entity) {
+      // Skip legacy - not allosed in markdown
+      if (entity[entity.length - 1] !== ';') { return; }
+
+      out[entity.slice(1, -1)] = strToUni(entities[entity].characters);
+    });
+
+    var result = []
+
+    Object.keys(out).forEach(function (key) {
+      result.push('  "' + key + '":"' + out[key] + '"');
+    });
+
+    console.log('{\n' + result.join(',\n') + '\n}');
+  });
+});