Rewind RecursiveIteratorIterator before use

Fixes #268 and #288.

More info: https://bugs.php.net/bug.php?id=62914

>As a reminder, all iterators have been designed in a way that you need to call rewind before using.
Add 'checked' property in _field_radio.htm

Add 'checked' property in _field_radio.htm
Merge pull request #301 from adisos/patch-1

Add 'checked' property in _field_radio.htm
Minor
Merge pull request #298 from Naxiz/master

Rewind RecursiveIteratorIterator before use
Merge branch 'develop'
Minor JS fixes
When checkbox list has more than 10 items, display it in a scrollable area
Establish the router earlier so we can create page URLs
Add new form behavior override: formCreateModelObject
Consider extensible classes (->methodExists()) when looking for dropdown options
Add 'manage partials' and fix my settings

Fixes #279.
Merge pull request #306 from Naxiz/fix-279

Add 'manage partials' and fix my settings
Ref #306 - mysettings should be unrestricted by permissions
Undo bad change
Update changelog
Fixes #308
Use 404 status code for custom 404 page

Fixes #275 and #291.
Improve the access denied (403) page

This is an improved version of the current access denied (403) page based on the built-in not found (404) page.

Shows a link to the CMS backend if the user is logged in and doesn't have permissions for the backend page it's trying to access, but does have permissions for the CMS backend.

Please note that the following languages are machine translated: ja, pt-br, ru and sv.
Merge pull request #314 from Naxiz/improved-403

Improve the access denied (403) page