Fix #267: log tip's id and mission text when student read tip
Merge branch 'master' into add-event-hint

Conflicts:
	ChangeLog
Edit readTip's event's commit to send mission text as a file
Merge branch 'master' into add-event-hint

Conflicts:
	ChangeLog
Merge pull request #270 from oster/add-event-hint

Create a log when the student reads the hint