[smartdown] better math processing: skipping pre/code/textarea
[smartdown] better math processing: skipping pre/code/textarea

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