Correct capitalization of JavaScript

JavaScript is most commonly written with a capital "J" and capital "S" (camel case). Examples of Google search results that capitalize "JavaScript" that way:

- <http://en.wikipedia.org/wiki/JavaScript>
- <http://www.codecademy.com/en/tracks/javascript>
- <https://developer.mozilla.org/de/docs/JavaScript>
- <http://de.selfhtml.org/javascript/>
- <http://www.w3schools.com/js/>
- <http://www.enable-javascript.com/>
- <http://getbootstrap.com/javascript/>
- <http://www.javascriptsource.com/>

To be consistent with the camel case capitalization of CommonMark, JavaScript should be capitalized correctly, too.