Added multiple collection_select for Charges on prisoner edit form.
Added select2 jquery plugin to use for charges multiple select on prisoner edit form.
Charges select on prisoner edit form now retrieves and selects the prisoner's saved charges.
Explicitly set permitted parameter article_ids to be an array in the prisoner and incident controllers in order to allow updating a prisoner's charges on the prisoner edit form.
Split articles in articles multiple select into criminal code labeled optgroups.