Ref #280 Updated the gradebook module to disable assessments rather than actually deleting them when removing them in the interface.
Refs #280: Creates assessment object and puts it in place where simple get queries are used. Couple minor bug fixes
Merge branch 'develop' of https://github.com/EntradaProject/entrada-1x into feature-assessment-deactivate

Conflicts:
	www-root/core/modules/admin/gradebook/assessments/edit.inc.php
	www-root/core/modules/admin/gradebook/assignments/edit.inc.php
Removed exit that was breaking the add assignment interface.
Merge pull request #434 from EntradaProject/feature-assessment-deactivate

Merging feature branch to deactivate Gradebook Assessments rather than deleting them