Plugin to create link reference to another post / page inside the site

This plugin adds a new role called :ref: to the rst compiler. Here is
an example of how it works:

    Please, check my :ref:`philosofy-ideas`.

Or, giving the text to link:

    Please, check my other :ref:`post about philosofy <philosofy-ideas>`.
Merge branch 'master' of github.com:getnikola/nikola