Upgrade tests tools and lint migrations and scripts (part 2) (#9998)

* upgrade gulp-babel

* upgrade babel-eslint

* upgrade eslint-friendly-formatter

* start upgrading chai

* start to upgrade eslint

* restore skipped tests

* start to upgrqde monk

* fix linting and remove unused file

* fix mocha notifications, and common tests

* fix unit tests

* start to fix initrgration tests

* more integration tests fixes

* upgrade monk to latest version

* lint /scripts

* migrations: start moving to /archive unused migrations and run eslint with --fix

* lint migrations

* fix more integration tests

* fix test

migrations/archive/2013/20130307_exp_overflow.js

@@ -0,0 +1,37 @@
+// mongo habitrpg ./node_modules/underscore/underscore.js ./migrations/20130307_normalize_algo_values.js
+
+/**
+ * Make sure people aren't overflowing their exp with the new system
+ */
+db.users.find().forEach(function (user) {
+  function oldTnl (level) {
+    return Math.pow(level, 2) * 10 + level * 10 + 80;
+  }
+
+  function newTnl (level) {
+    let value = 0;
+    if (level >= 100) {
+      value = 0;
+    } else {
+      value = Math.round((Math.pow(level, 2) * 0.25 + 10 * level + 139.75) / 10) * 10; // round to nearest 10
+    }
+    return value;
+  }
+
+  var newTnl = newTnl(user.stats.lvl);
+  if (user.stats.exp > newTnl) {
+    let percent = user.stats.exp / oldTnl(user.stats.lvl);
+    percent = percent > 1 ? 1 : percent;
+    user.stats.exp = newTnl * percent;
+
+    try {
+      db.users.update(
+        {_id: user._id},
+        {$set: {'stats.exp': user.stats.exp}},
+        {multi: true}
+      );
+    } catch (e) {
+      print(e);
+    }
+  }
+});