escape-html-in-json

Escape HTML entities in JSON.stringify, using a replacer method.

``javascript
> var escape_html_entities = require('escape-html-in-json')
> var object = {name: ""}
> JSON.stringify(object)
'{"name":""}'
> JSON.stringify(object, escape_html_entities)
'{"name":"<script>alert('hacked');</script>"}'
``