Stackoverflow-like permalinks with Jekyll - url

Question

I really have taken a liking to Stackoverflow's permalinks. The way I understand them to work is as follows:
https://stackoverflow.com/questions/uniqueid/post-title-for-seo
The following gets the job done too https://stackoverflow.com/questions/15721310:
https://stackoverflow.com/questions/uniqueid
Interestingly, if you put anything after uniqueid you will get to the question
https://stackoverflow.com/questions/100001/hello-world
https://stackoverflow.com/questions/100001/hello-cruel-world
https://stackoverflow.com/questions/100001/hello-strange-world
All of the above work, this allows you to change the question's title without losing all your permalinks.
I'm using jekyll and I plan to launch on github with github-pages (which doesn't allow .htaccess). If it can be done with jekyll without github-pages (which I'm sure is much easier) then I'd be willing to deploy it to a hosted VPS. I'm open to any solution!
I would also like questions to be a specific variable in the post like post.category or post.template such as blog or portfolio.

Answer 1

The only close this I found in Jekill Docs is to define permalink in every post:
---
layout: share
title: CoffeeScript Spaces and Tabs
date: 2013-09-17
categories: [coffee, eclipse, nodeclipse, enide, studio, monster]
permalink: /share/coffeescript-spaces-and-tabs
---
I see no trace of post ID concept in Jekyll. I hope someone can suggest how to do that with variables or some other way.