added id to content, added models/Role, small fixes
Merge branch 'master' of github.com:fkn/domic3

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#	new file:   models/Course.js
#	new file:   models/Material.js
#	new file:   models/TestAnswerManyChoice.js
#	new file:   models/TestAnswerOneChoice.js
#	new file:   models/TestAnswerOpen.js
#	new file:   models/TestGroup.js
#	new file:   models/TestQuestion.js
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