Adding more game dev tools.

Adding entries for Texture Packer, ShoeBox and Tiled Map Editor.
For the record, this is the Keyboard page with `h1` / `#`:

![](http://i.imgur.com/2DUY6Em.png)

And this is what it actually looks like, with `h2`:

![](http://i.imgur.com/M3DlSgv.png)

The page title is a `h1`, so we shouldn't use that inside of the doc.