Further rename

Further rename

Default to first admin email

Revert whitespace

Add permission checks using django-rules for adding FAQ questions, reporting issues and giving feedback

Use send_templated_mail, therefore adding new hjelp email template and making according changes in views

Created a row of issues on the way 

Completely changes the method used to display a simple TextInput field in the dynamic bug_categories row; now using an extra CharField which is turned visible/invisible.
Add free_text field to models.py, change migrations and admin.py accordingly.
Added modified top/bottom margins in hjelp.css.
Further disables all fields that are not visible and simplifies jQuery section of rebus.html.
Modifies models.py so that children are deleted when the free text option is selected.

rebus.html template: merge the ability to show/hide the next select field into setNextProperties function, automatically does not display next field if there are no children present

- Models: remove toplevel field and replace it with placeholder field for children, adding tagging option for children
- Migrations: change 0002_add_bug_report.py according to models.py
- Forms: add default placeholder for first field, remove queryset filtering according to toplevel attribute
- Admin: remove displaying of toplevel and replacing it by placeholder, add tagging
- Views/URLs: replace rebus_get_icon AJAX request with a new rebus_get_next_properties which also includes the children's placeholder and tagging possibility
- rebus.html template: remove default bug category labels, change javascript updating of next field according to new AJAX request, add functionality to toggle the ability to use tagging input and to change placeholder dynamically

- small changes at REBUSCategory model
- implement dependent ModelSelect2Widget in forms.py
- include django-select2 CSS and JS in rebus.html
- include select2-materialize.css/select2-materialize.js plugin in order to materialize select2-fields in rebus.html
- parse REBUSCategory-objects to strings in views.py
- add 0002_add_bug_report.py migration