Add Hyper to the “in the wild” list in README

Clarifies when to use `Number` vs. `parseInt` for Number type casting.

Fixes: airbnb#523

Clarify proper type casting for Numbers

- react/jsx-quotes has been superseded by jsx-quotes
- eqeqeq now covers comparisons to null

Eslint config defaults

Create eslint-config-airbnb/legacy to export ES5-only rules

prepare eslint-config-airbnb v0.1.0

Clarify strict ESLint rule

Add Ecosia to "In the Wild" section.

Add reasoning for using double quotes in JSX

Add HubSpot to 'In The Wild' section

This addresses airbnb#483

In airbnb#483, justjake said that we should update the style guide to allow
single line comments in the first line of a block.

[guide] missing 's', create(s) under Method

As suggested by @ljharb in airbnb#579 (comment)

[guide] Bring back note about braces

[eslint config] [breaking] enable `quote-props` rule.

readme

[guide] clarity in destructuring code example

[guide] Fixed typo in URL

…oted.

[guide] Link to the eslint rule for radix in parseInt

Ignore URLs in max-len

[eslint config] [minor] Allow multiple stateless components in a single file

Per airbnb#668.

…date