Cc kapi messages

This changes ```cc_kapi``` to make it more accurate with its HTTP response codes. Small changes to javascript to post alerts to user on AJAX actions.

### CC_KAPI

* Now returns a 404 if a keyboard isn't found, rather than a 204


### counter.js

* Adds new function to create alerts
* Add an alert when a new keyboard is saved to prompt the user that action has occurred