Added NoEmptyLinesAfterPhpdocsFixer

Say hello to another fixer. :)
Is the desription a bit off? or the implementation? Tests show that empty lines after docblocks are not removed:

https://github.com/FriendsOfPHP/PHP-CS-Fixer/pull/864/files#diff-943e84ac15f9d05b18359dae8066b7c5R85