Filter out the unnecessary tag filters. Used in http://demo.codestag.com/forest/

diff.js

var all_filters = $('#all-skills').data('all-filters'),
		all_skills  = $('#all-skills').data('all-skills');

all_filters.filter(function(i,v){
	if( all_skills.indexOf(i) === -1 ) {
		var diff = all_filters[v];
		$('.portfolio-filter').find("[data-filter='"+ diff +"']").addClass('invalid');
	}
});