Update icons generator, or remove it

[splhack]

Do you guys know Retina supported docerator.py?
https://code.google.com/p/docerator/

Or anyone want to update docerator.py for generating Retina icons?

I'll remove icon generation code if the both answers are no.

• docerator.py: need to support Retina

• makeicns: superseded by /usr/bin/iconutil. I'll just remove src/MacVim/icons/makeicns in any case.

  $ ls MacVim.iconset
  icon_128x128.png
  icon_128x128@2x.png
  icon_16x16.png
  icon_16x16@2x.png
  icon_256x256.png
  icon_256x256@2x.png
  icon_32x32.png
  icon_32x32@2x.png
  icon_512x512.png
  icon_512x512@2x.png
  $ iconutil --convert icns MacVim.iconset # -> MacVim.icns