FIX: select-kit refactoring

- improve mini-tag-chooser keyboard behavior
- all multil select now respond to select all and left/right arrows
- improve events handling
- many minor tweaks

app/assets/javascripts/select-kit/components/dropdown-select-box.js.es6

@@ -21,7 +21,7 @@ export default SingleSelectComponent.extend({
   },
 
   didClickOutside() {
-    if (this.get("isExpanded") === false) return;
+    if (!this.get("isExpanded")) return;
     this.close();
   },