Address comments in #639

[eslint] Add comment above `max-len` rule with link to its docs
[eslint] Change tab width for `max-len` rule from 4 to 2
[eslint] Replace double quotes around `max-len` with single quotes
[eslint] Use object form of `max-len` and include all of the options

packages/eslint-config-airbnb/rules/style.js

@@ -35,7 +35,17 @@ module.exports = {
     // disallow mixed 'LF' and 'CRLF' as linebreaks
     'linebreak-style': 0,
     // specify the maximum length of a line in your program
-    "max-len": [2, 100, 4],
+    // https://github.com/eslint/eslint/blob/master/docs/rules/max-len.md
+    'max-len': [2, {
+      'code': 100,
+      'comments': 100,
+      'commentLength': 100,
+      'tabWidth': 2,
+      'ignoreUrls': false,
+      'ignorePattern': null,
+      'ignoreTrailingComments': false,
+      'ignoreComments': false
+    }],
     // specify the maximum depth callbacks can be nested
     'max-nested-callbacks': 0,
     // require a capital letter for constructors