Fixing some bugs with Stylus 0.46.0

There was a complaint about grid floating which is fixed: #48.

`@css` escaping was also breaking. Seemed like a bug in Stylus rather than this project, but since Stylus >= 0.44 works fine with `@-ms-viewport tags`, I just removed the `@css` escaping.
To do that I had to upgrade the project to 0.44.
I hope that's okay. The resulting CSS in 0.44 is mostly identical to 0.42. Nothing that'd make a difference from the browser's point of view, though.

The last issue I found while trying this out on 0.46 was a  weird issue with `@extend`ing in `type.styl` file. The `.dl-horizontal dd` rule `@extend`s `.clearfix` and does a straight `@extend`. Seems like another issues that Stylus itself should sort out.

Note that I didn't rebuild the CSS dist file. I just changed the Stylus files.