Update EJS and Stylus

For #24, adds a

* [new, minor version of EJS](https://github.com/visionmedia/ejs/blob/master/History.md#085--2013-11-21)
* [new, major version of Stylus](https://github.com/LearnBoost/stylus/blob/master/History.md#0410--2013-11-30) adds the first version of `{block}`, which gives Stylus’ something like Sass’ `@contents`.

There’s a new version of Marked out, too, but it shouldn’t be updated until https://github.com/chjj/marked/issues/276 is closed.