Re-rasterize OS X bundle icon.

Rasterized using Inkscape. Fixes the incorrectly blended white fringes the old icon had at all resolutions below 512x512. Also includes retina-sized images.

The position of the eye changed slightly, but all of the svg renderers I checked agreed on the new position, so I can only assume the old one was slightly wrong.

I couldn't find sources for the document icons, and I suspect they don't exist (in vector form, at least), so they haven't been updated.