Add missing ContextMenu.js
Merge branch 'master' of https://github.com/mjdslob/mathunited
Pre-pull commit
Merge branch 'master' of https://github.com/mjdslob/mathunited
Multi paragraph-ref's

- setExerciseMetadata makes new container for each exercise

- Multiple paragraph refs are shown

- User is offered to enable paragraph-refs of other exercises

- User can delete paragraph-refs
Merge remote-tracking branch 'origin/master'

Conflicts:
	Author-java/MathUnited/src/main/webapp/xslt/editor/exercise.xslt