Merge branch 'development'

Merge branch 'development'

Merge branch 'development'

Merge branch 'development'

Added tests for deleting one task and deleting all tasks from problem

Removed unused file

Merge branch 'development'

Merge branch 'development'

Merge branch 'development'

Refactored tests and added a test for importing tasks and vehicles on…

… one request. This is not yet implemented on the production server so atm if importing import tasks and vehicels separately.