Merge pull request #6 from poiru/master

Language tweaks and fixes
fix unclosed tag
Fix a missing assignment tag
another unclosed tag issue
removed dls and added unlock conditions
Merge branch 'master' of github.com:UniversityHelsinkiTKTL/MOOC-materiaali
typo fix
Merge branch 'master' of github.com:UniversityHelsinkiTKTL/MOOC-materiaali
Tweaks and fixes to week 1