ROOMS-139: Fix Warning: range() [function.range]: step exceeds the specified range in rooms_booking_edit_form() randomly happen bug that was caused due a PHP bug in versions < 5.3.6 and mostly in Windows OS. See: https://bugs.php.net/bug.php?id=51894 and http://trac.symfony-project.org/ticket/8174
Merge pull request #37 from BluesparkLabs/ROOMS-139-2158843

Issue #2158843 happens only when use PHP versions < 5.3.6