Updated feature: Gleez HTMLFilter

+ Cleanup PHPDoc
+ Removed PHPDoc applies only to Drupal
+ Removed HTMLFilter::valid_utf8 - now we use Valid::utf8
+ Fixed HTMLFilter::xss_attributes - added missed initial $skip param
+ Improved HTMLFilter::factory, HTMLFilter::__construct - $filter is array
+ Wrapped up log writer in a development mode
+ Fixed typos