Convert problem decomposition lecture into readable material
Add link to problem decomposition and remove refactoring
Make handling mixed cases optional in Making Choices 3
Add new making choices exercise
Add tool for collecting grades from grade sheets
Add tool for automatically creating grade sheets
Add new exercise on combining the basics
Merge branch 'master' into gh-pages
Add exercises for forth programming assignment
Fix link to data in exercise
Merge branch 'master' into gh-pages