Preset: enforce Airbnb rule 25.1

Closes gh-2075

Author: Joe Bartlett

presets/airbnb.json

@@ -42,6 +42,7 @@
     "requireSpaceBeforeBinaryOperators": true,
     "requireSpaceAfterBinaryOperators": true,
     "requireCamelCaseOrUpperCaseIdentifiers": true,
+    "requireDollarBeforejQueryAssignment": true,
     "requireLineFeedAtFileEnd": true,
     "requireCapitalizedConstructors": true,
     "requireDotNotation": true,

test/data/options/preset/airbnb.js

@@ -5,6 +5,9 @@
     anotherSuperLongParam="baz"
   />;
 
+  // requireDollarBeforejQueryAssignment
+  var $div = $('.container');
+
   // validateIndentation: 2
   'use strict';