add 2012 final questions
press page update
removing the rules for semifinal to make it simpler and clearer (more detailed rules are on the first page of tasks)
updating the global rules
removing the 'receive mail when registration opens' form in the right bar
archived 2012 and prep for registration 2013 NL. fix #146
Merge pull request #147 from jganseman/master

archive 2012 + prep registration 2013 NL
update after discuss with JGa.
typos
fix 25y->21y
fix NL registration and rules
Merge pull request #148 from jganseman/master

fixed NL registration
add a sentence to explain the share buttons
add share link on referral page (fr only)
referral link added NL
Merge pull request #149 from jganseman/master

referral update
put the new sponsorship brochure
sponsors 2012-> sponsors
completely clean the sponsors page in both lang
typo