Support for Wykop.pl - new provider

First of all, this is my first pull request on github, so please let me know if I am doing something wrong :)

http://wykop.pl/ is very popular website in Poland.

Based on documentation (http://www.wykop.pl/dla-programistow/dokumentacja/) and available port of wykop-sdk for python (https://github.com/p1c2u/wykop-sdk) I have prepared new provider for django-allauth :)

Please let me know If I am done something wrong, and if something should be rewritten.