Merge pull request #72 from luisrudge/ie-filter-fix

Fixes ie filtering bug.

js/bootstrap-multiselect.js

@@ -440,9 +440,12 @@
 		    if (this.query == '') return this.originalOptions;
 		    var query = this.query;
 
-		    return $(this.originalOptions).filter(function () {
-		        return this.text.substring(0, query.length) == query
+		    var options = [];
+		    $.each(this.originalOptions, function(index, option) {
+		        if (option.text.substring(0, query.length) == query) options.push(option);
 		    });
+
+		    return options;
 		},
 	   
 	   updateOriginalOptions: function() {