devel/colormake: unbreak the port and update to the latest version

• Update to version 0.9.20140503 (project is now hosted on GitHub)
• Improve grammar in COMMENT, define LICENSE (GPLv2 or later)
• Set NO_ARCH=yes, sort PLIST_FILES, install documentation files
• Clean up and shorten regexp in the `post-patch' target recipe
• Amend port description; take maintainership for the time being

Inspired by: Debian package