Made single selection checking work properly so .val() returns correctly

Removed browser sniffing for IE and use :selected pseudoselector everywhere

js/bootstrap-multiselect.js

@@ -210,9 +210,10 @@
 					$checkboxesNotThis.filter(function () { return $(this).is(':checked') != checked; }).trigger('click');
 				}
 				if (checked) {
-					option.attr('selected', 'selected').prop('selected', true);
+				    option.prop('selected', true);
 
-					if (!this.options.multiple)	{
+				    if (!this.options.multiple)
+				    {
 						if (this.options.selectedClass) {
 							$($checkboxesNotThis).parents('li').removeClass(this.options.selectedClass);
 						}
@@ -228,9 +229,10 @@
 					if (this.options.selectedClass == "active") {
 						$optionsNotThis.parents("a").css("outline", "");
 					}					
+
 				}
 				else {
-					option.removeAttr('selected');
+					option.removeAttr('selected').prop('selected', false);
 				}
 				
 				var options = this.getSelected();
@@ -377,14 +379,14 @@
 		
 		// For IE 9 support.
 		getSelected: function() {
-			if (navigator.appName == 'Microsoft Internet Explorer') {
-				var regex  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
-				if (regex.exec(navigator.userAgent) != null) {
-					return $('option:selected[value!="select-all-option"]', this.$select);
-				}
-			}
+			//if (navigator.appName == 'Microsoft Internet Explorer') {
+			//	var regex  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
+			//	if (regex.exec(navigator.userAgent) != null) {
+			//		return $('option:selected[value!="select-all-option"]', this.$select);
+			//	}
+			//}
 		
-			return $('option[selected][value!="select-all-option"]', this.$select);
+			return $('option:selected[value!="select-all-option"]', this.$select);
 		}
 	};