Portfolio: Added old UvA presentation.

portfolio/latex/code/activerecord.php

portfolio/latex/code/model.php

portfolio/latex/code/nested-selectors.css

portfolio/latex/code/server-imports.css

portfolio/latex/code/xhp.php

portfolio/latex/images/code-editor.png

portfolio/latex/images/create-new-exam.png

portfolio/latex/images/redox-uitleg.png

portfolio/latex/images/redox-voorbeeld.png

portfolio/latex/images/toetsoverzicht.png

portfolio/latex/images/toetspagina-1.png

portfolio/latex/images/toetspagina-2.png

portfolio/latex/images/toetspagina-3.png

portfolio/latex/images/vo20-db-2010.png

portfolio/latex/images/vo20-logo.png

portfolio/latex/images/xhp.png

portfolio/latex/presentation.tex