Platform-specific packaging

[dahlia]

Although we currently provide official binaries for every release, it would be great if we have platform-specific packages as well.

• [ ] Debian/Ubuntu APT (See also Packaging/PPA docs from Launchpad)
• [ ] Homebrew (See also How to Create and Maintain a Tap)

[qria]

I've set the initial brew, which can be installed with brew install spoqa/homebrew-nirum/nirum.

However it is currently build-from-source only because I was not able to set up homebrew bottles with existing binary.

Also it looks like it is possible to set up bottles for custom tap. Might be interesting to look into.