Merge branch '121-copy-assignments-to-new-edition' into 'development'

CHANGELOG.md

.../java/nl/tudelft/submit/controller/EditionController.java

...n/java/nl/tudelft/submit/controller/ModuleController.java

...ain/java/nl/tudelft/submit/exception/ImportException.java

...ain/java/nl/tudelft/submit/service/AssignmentService.java

src/main/java/nl/tudelft/submit/service/FileService.java

src/main/java/nl/tudelft/submit/service/ModuleService.java

src/main/resources/messages.properties

src/main/resources/templates/assignment/view.html

src/main/resources/templates/edition/top.html

src/main/resources/templates/edition/view.html

src/main/resources/templates/module/import.html

src/main/resources/templates/module/view.html

...a/nl/tudelft/submit/controller/EditionControllerTest.java

...va/nl/tudelft/submit/controller/ModuleControllerTest.java

...java/nl/tudelft/submit/service/AssignmentServiceTest.java

...est/java/nl/tudelft/submit/service/ModuleServiceTest.java