[WIP] Polish Documentation

I think that documentation available in Polish can convert more developers to look at Phalcon.

This PR should be kept open until the translation is ready. I have created it so early to not duplicate the translation process and focus efforts on a single root for Polish documentation. I will try to keep my repository up to date with [phalcon/docs:master](http://github.com/phalcon/docs/tree/master).

**To Polish developers gathered around Phalcon:** please review the translation and contribute (preferably by forking my repository and creating PRs).

PS. I think that ``_static`` folder can be put above all language folders and symlinked. But if you are against symlinking, a Makefile step can be created to copy the content of ``/_static`` to ``/LANG/_static``.