Merge pull request #154 from jganseman/master

registration closure NL
quick bug fix, missing import
Merge branch 'master' of github.com:be-oi/beoi-website
quick fix, inverted registration conditionn
quick fix, inverted registration conditionn (NL)
updating the site for semifinal done
Merge pull request #155 from jganseman/master

added 2013 semifinal Q&A
demi-finale fr
semifinal pdf's fr
typos in fr (received by mail)
removing registration buttons
semifinal results
fixed last typo in NL questions