Added oefeningen.
Merge branch 'master' into dtd3

* master:
  Added comments to NewGames class.
  Added 'page' exercises.
  Add FIX ME text to output to see correct block configuration.
  And same for v4
  Reuse yml from v2
  Some whitespace + text change.
  Add link to d.o for info.yml file.
Merge branch 'master' into dtd3

* master:
  Fixed phpdocs, added @param statements
  Teeny tiny grammar changes.
  Comments added to Block class step 5
  Removing .info.yml files from steps 2 - 5
Merge pull request #6 from mauzeh/dtd3

Really small changes, this time in the right branch...