Integrates Sass, compresses production CSS.

Squashed commit of the following:

commit 68706a01c90be6bb4d3f4e1bf07f21d0c7db0586
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sun Jun 8 17:25:51 2014 -0500

    Bumps to 0.4.10.

commit 04477f4a7b6377f2bda0d428e72cbc3841675a03
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sun Jun 8 17:25:09 2014 -0500

    Tweaks <select> background.

commit 36ad883b410b113487f36caa017cb093617fb9ad
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sun Jun 8 17:13:24 2014 -0500

    Improves Compass development and production tasks.

commit 8810a6aea7d8dec1760b39d0c4845b93dabb4be6
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sun Jun 8 17:04:34 2014 -0500

    Compresses generated CSS.

commit 982584c23caf8bc642126a83f91b67ad947ea849
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sun Jun 8 12:15:04 2014 -0500

    First-pass at Sass/Compass integration.