Added association for unit roles to unit that is destroyed when the unit is destroyed
Added association for unit roles to unit that is destroyed when the unit is destroyed

jakerenzella/doubtfire-api,jakerenzella/doubtfire-api,alexcu/doubtfire-api,final-year-project/doubtfire-api,final-year-project/doubtfire-api,jakerenzella/doubtfire-api,doubtfire-lms/doubtfire-api,jakerenzella/doubtfire-api,doubtfire-lms/doubtfire-api,doubtfire-lms/doubtfire-api,doubtfire-lms/doubtfire-api,jakerenzella/doubtfire-api,alexcu/doubtfire-api,alexcu/doubtfire-api,jakerenzella/doubtfire-api,doubtfire-lms/doubtfire-api,final-year-project/doubtfire-api,final-year-project/doubtfire-api,final-year-project/doubtfire-api,alexcu/doubtfire-api,jakerenzella/doubtfire-api,doubtfire-lms/doubtfire-api,alexcu/doubtfire-api,doubtfire-lms/doubtfire-api,alexcu/doubtfire-api