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Merge branch 'master' of https://github.com/mathilwa/Master2013
Merge branch 'master' of https://github.com/mathilwa/Master2013
Merge branch 'master' of https://github.com/mathilwa/Master2013
Merge branch 'master' of https://github.com/mathilwa/Master2013
Added text about video games and serious games. Added references