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
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