Update NNM - Europe.txt

http://www.reddit.com/r/Vic2Mod/comments/2o6t2g/another_culture_poll_this_one_is_more_broad/cmkhoxx Re-adding Yugoslavic cores.
Update NNM - Europe.txt

Commenting out code that removed Yugoslavic cores as per http://www.reddit.com/r/Vic2Mod/comments/2o6t2g/another_culture_poll_this_one_is_more_broad/cmkhoxx
Merge pull request #21 from LordNotix/master

FIX Yugoslavic Cores