Squashed commit of the following:

commit 0a3909ad2ed58cd1c8c13a2818e18dfaa03a51b2
Author: Seth N. Hetu <seth.hetu@gmail.com>
Date:   Sat Oct 4 22:25:23 2014 -0400

    Fixed window resize callbacks on OS-X.

commit eb458e30aaa0c46d831f85b0b44d5bf6a50a9471
Author: Seth N. Hetu <seth.hetu@gmail.com>
Date:   Sun Sep 28 21:58:30 2014 -0400

    This should cause window BG colors to work (but at the moment it doesn't).
Merge pull request #1 from sorlok/cocoa_resize

Fix resizing callback on Cocoa.