Added MarkTheWords as a library option in Course Presentation elements.
Added dragText as a cp option.
Merge branch 'markTheWords' of github.com:h5p/h5p-course-presentation into markTheWords
Merge branch 'master' into markTheWords
Merge branch 'markTheWords'
Merge branch 'more-buttons' of github.com:h5p/h5p-course-presentation into more-buttons
Merge branch 'master' into more-buttons