Return 204 with no content when document does not exist
Merge pull request #252 from LearningLocker/develop

Return 204 with no content when document does not exist
Set the objectType on the object if not passed

While the `$object_type` var was being correctly set, the `objectType` key was not being set where the key did not previously exist.
Merge pull request #257 from LearningLocker/master

Fix
Tweak to activity repo
tweaks
Convert timestamp
Sort out spacing
Remove trace from app missing
Improve migration
Merge pull request #259 from LearningLocker/develop

Convert timestamp
Merge branch 'upstream_master' into feature/250

Conflicts:
	app/locker/data/dashboards/LrsDashboard.php
fixes #250: Revert some changes, because upstream uses another field timestamp field