Update xulNode.php.inc

Refactored node method yield to triggerYield in order to create a time-window to upgrade all existing SF applications for PHP5.5 compatibility.
Update VERSION

Bumped version file
Merge pull request #34 from sitefusion/hotfix/1.6.6

Fixed XULTextBox - wrong reference to JS attribute
Fixed issue with the customTree; The error: Undefined offset...
Updated the version file
Merge branch 'hotfix/6.1.7' into develop

Conflicts:
	VERSION