clean up code

OSKA.php

OskaCronjob.php

controllers/admin.php

controllers/mentoring.php

controllers/widget.php

css/oska.css

js/oska.js

models/OskaMatches.php

models/OskaMentees.php

models/OskaMentors.php

plugin.manifest

templates/widget_form.php

views/admin/index.php

views/admin/matches.php

views/admin/mentees.php

views/admin/mentors.php

views/admin/set_match.php

views/mentoring/index.php

views/mentoring/mentee_list.php