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diff --git a/school/node_modules/psl/index.js b/school/node_modules/psl/index.js
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+/*eslint no-var:0, prefer-arrow-callback: 0, object-shorthand: 0 */
+'use strict';
+
+
+var Punycode = require('punycode');
+
+
+var internals = {};
+
+
+//
+// Read rules from file.
+//
+internals.rules = require('./data/rules.json').map(function (rule) {
+
+  return {
+    rule: rule,
+    suffix: rule.replace(/^(\*\.|\!)/, ''),
+    punySuffix: -1,
+    wildcard: rule.charAt(0) === '*',
+    exception: rule.charAt(0) === '!'
+  };
+});
+
+
+//
+// Check is given string ends with `suffix`.
+//
+internals.endsWith = function (str, suffix) {
+
+  return str.indexOf(suffix, str.length - suffix.length) !== -1;
+};
+
+
+//
+// Find rule for a given domain.
+//
+internals.findRule = function (domain) {
+
+  var punyDomain = Punycode.toASCII(domain);
+  return internals.rules.reduce(function (memo, rule) {
+
+    if (rule.punySuffix === -1){
+      rule.punySuffix = Punycode.toASCII(rule.suffix);
+    }
+    if (!internals.endsWith(punyDomain, '.' + rule.punySuffix) && punyDomain !== rule.punySuffix) {
+      return memo;
+    }
+    // This has been commented out as it never seems to run. This is because
+    // sub tlds always appear after their parents and we never find a shorter
+    // match.
+    //if (memo) {
+    //  var memoSuffix = Punycode.toASCII(memo.suffix);
+    //  if (memoSuffix.length >= punySuffix.length) {
+    //    return memo;
+    //  }
+    //}
+    return rule;
+  }, null);
+};
+
+
+//
+// Error codes and messages.
+//
+exports.errorCodes = {
+  DOMAIN_TOO_SHORT: 'Domain name too short.',
+  DOMAIN_TOO_LONG: 'Domain name too long. It should be no more than 255 chars.',
+  LABEL_STARTS_WITH_DASH: 'Domain name label can not start with a dash.',
+  LABEL_ENDS_WITH_DASH: 'Domain name label can not end with a dash.',
+  LABEL_TOO_LONG: 'Domain name label should be at most 63 chars long.',
+  LABEL_TOO_SHORT: 'Domain name label should be at least 1 character long.',
+  LABEL_INVALID_CHARS: 'Domain name label can only contain alphanumeric characters or dashes.'
+};
+
+
+//
+// Validate domain name and throw if not valid.
+//
+// From wikipedia:
+//
+// Hostnames are composed of series of labels concatenated with dots, as are all
+// domain names. Each label must be between 1 and 63 characters long, and the
+// entire hostname (including the delimiting dots) has a maximum of 255 chars.
+//
+// Allowed chars:
+//
+// * `a-z`
+// * `0-9`
+// * `-` but not as a starting or ending character
+// * `.` as a separator for the textual portions of a domain name
+//
+// * http://en.wikipedia.org/wiki/Domain_name
+// * http://en.wikipedia.org/wiki/Hostname
+//
+internals.validate = function (input) {
+
+  // Before we can validate we need to take care of IDNs with unicode chars.
+  var ascii = Punycode.toASCII(input);
+
+  if (ascii.length < 1) {
+    return 'DOMAIN_TOO_SHORT';
+  }
+  if (ascii.length > 255) {
+    return 'DOMAIN_TOO_LONG';
+  }
+
+  // Check each part's length and allowed chars.
+  var labels = ascii.split('.');
+  var label;
+
+  for (var i = 0; i < labels.length; ++i) {
+    label = labels[i];
+    if (!label.length) {
+      return 'LABEL_TOO_SHORT';
+    }
+    if (label.length > 63) {
+      return 'LABEL_TOO_LONG';
+    }
+    if (label.charAt(0) === '-') {
+      return 'LABEL_STARTS_WITH_DASH';
+    }
+    if (label.charAt(label.length - 1) === '-') {
+      return 'LABEL_ENDS_WITH_DASH';
+    }
+    if (!/^[a-z0-9\-]+$/.test(label)) {
+      return 'LABEL_INVALID_CHARS';
+    }
+  }
+};
+
+
+//
+// Public API
+//
+
+
+//
+// Parse domain.
+//
+exports.parse = function (input) {
+
+  if (typeof input !== 'string') {
+    throw new TypeError('Domain name must be a string.');
+  }
+
+  // Force domain to lowercase.
+  var domain = input.slice(0).toLowerCase();
+
+  // Handle FQDN.
+  // TODO: Simply remove trailing dot?
+  if (domain.charAt(domain.length - 1) === '.') {
+    domain = domain.slice(0, domain.length - 1);
+  }
+
+  // Validate and sanitise input.
+  var error = internals.validate(domain);
+  if (error) {
+    return {
+      input: input,
+      error: {
+        message: exports.errorCodes[error],
+        code: error
+      }
+    };
+  }
+
+  var parsed = {
+    input: input,
+    tld: null,
+    sld: null,
+    domain: null,
+    subdomain: null,
+    listed: false
+  };
+
+  var domainParts = domain.split('.');
+
+  // Non-Internet TLD
+  if (domainParts[domainParts.length - 1] === 'local') {
+    return parsed;
+  }
+
+  var handlePunycode = function () {
+
+    if (!/xn--/.test(domain)) {
+      return parsed;
+    }
+    if (parsed.domain) {
+      parsed.domain = Punycode.toASCII(parsed.domain);
+    }
+    if (parsed.subdomain) {
+      parsed.subdomain = Punycode.toASCII(parsed.subdomain);
+    }
+    return parsed;
+  };
+
+  var rule = internals.findRule(domain);
+
+  // Unlisted tld.
+  if (!rule) {
+    if (domainParts.length < 2) {
+      return parsed;
+    }
+    parsed.tld = domainParts.pop();
+    parsed.sld = domainParts.pop();
+    parsed.domain = [parsed.sld, parsed.tld].join('.');
+    if (domainParts.length) {
+      parsed.subdomain = domainParts.pop();
+    }
+    return handlePunycode();
+  }
+
+  // At this point we know the public suffix is listed.
+  parsed.listed = true;
+
+  var tldParts = rule.suffix.split('.');
+  var privateParts = domainParts.slice(0, domainParts.length - tldParts.length);
+
+  if (rule.exception) {
+    privateParts.push(tldParts.shift());
+  }
+
+  parsed.tld = tldParts.join('.');
+
+  if (!privateParts.length) {
+    return handlePunycode();
+  }
+
+  if (rule.wildcard) {
+    tldParts.unshift(privateParts.pop());
+    parsed.tld = tldParts.join('.');
+  }
+
+  if (!privateParts.length) {
+    return handlePunycode();
+  }
+
+  parsed.sld = privateParts.pop();
+  parsed.domain = [parsed.sld,  parsed.tld].join('.');
+
+  if (privateParts.length) {
+    parsed.subdomain = privateParts.join('.');
+  }
+
+  return handlePunycode();
+};
+
+
+//
+// Get domain.
+//
+exports.get = function (domain) {
+
+  if (!domain) {
+    return null;
+  }
+  return exports.parse(domain).domain || null;
+};
+
+
+//
+// Check whether domain belongs to a known public suffix.
+//
+exports.isValid = function (domain) {
+
+  var parsed = exports.parse(domain);
+  return Boolean(parsed.domain && parsed.listed);
+};