add option to form and db
Add introduction to readme
typo on event log
Merge branch 'develop' into feature/activity_completion_tracking

Conflicts:
	lang/en/accredible.php
	lib.php
completion tracking (still testing)
fixed quiz completion tracking bug
Merge branch 'feature/activity_completion_tracking' into develop
Merge commit '4c9a5b94f632fc3c7a03b1df0bb9cebc56b7be22' into develop