[WIP] stack-router

Hi!

I am not sure this is the right place to add it. 

I write router middleware (I do not ready to publish it yet) based on symfony-routing component. There is some examples of using it: https://gist.github.com/m00t/1fe5bea690809531c9a5 . Is it interesting and worth to be included to official stack components? May be somebody have some thoughts about what this middleware should include, so I can rethink and reimplement something before I publish it?

Please, do not merge this branch, because packagist package and github repo are not awailable now