escape string for safe use in html

 This module escape a string to be safe for use in html particularly
 inside a script tag.
 .
 In programming languages escape sequences are used in character
 literals and string literals, to express characters which are not
 printable or clash with the syntax of characters or strings.
 .
 This module is a dependency of browserify, a tool that allows one
 to write Node.js-style modules that compile for use in the browser.
 .
 Node.js is an event-based server-side JavaScript engine.