NEW: graphics/pikopixel

Hi,

Here's a port for PikoPixel, a pixel-art image editor for Mac OS which
also runs on other UNIXes (using the GNUstep framework).

It's a pretty straightforward port with the x11/gnustep module.
The only tricky thing was the versioning. Upstream tags it 1.0-b10b.
I think the version 1.0.beta10b i have used conforms to packages-specs(7).

DESCR:
> PikoPixel is a free application for drawing & editing pixel-art images.
> It is originally for Mac, but it also runs on other Unix-like platforms
> using the GNUstep framework.
>
> Its features include:
> - Easy to use
> - Unlimited undo
> - Supports multiple layers
> - Customizable canvas background
> - Hotkey-activated popup panels
> - Export upscaled images
> - Supports linear (gamma-correct) color blending

This program is also ported to FreeBSD (which i based this Makefile at).

OK?

--
Lucas de Sena