[includedeck] added attribution extension (also by default in profile-3)
[includedeck] added attribution extension (also by default in profile-3)

ProgRT/deck.js,twitwi/deck.js,twitwi/deck.js,alexjobs/deck.js-1,alexjobs/deck.js-1,twitwi/deck.js,ProgRT/deck.js,alexjobs/deck.js-1,ProgRT/deck.js