Select option with TAB key

A client asked me they want to able to select an option by pressing tab. I thought it would be nice if Selectize has this feature by default.

src/selectize.js

@@ -427,6 +427,9 @@ $.extend(Selectize.prototype, {
 				self.advanceSelection(1, e);
 				return;
 			case KEY_TAB:
+				if (self.isOpen && self.$activeOption) {
+					self.onOptionSelect({currentTarget: self.$activeOption});
+				}
 				if (self.settings.create && self.createItem()) {
 					e.preventDefault();
 				}