Merge pull request #2 from vy/master

OYGL 2013 attendance report.
Merge pull request #4 from vy/master

Fix dates.
Merge pull request #5 from vy/master

Add "Görseller" section.
Merge pull request #6 from vy/master

Fix OYGL 2013 photos link.
neden scala sunum htlm i ekleniyor
sunum belglerine link
Merge pull request #7 from csenol/master

neden scala sunumu
Moved OYLG 2013 "Neden Scala?" slides to gh-pages.
Fix OYLG 2013 "Neden Scala?" slides link.