http://stackoverflow.com/questions/40081014/component-had-no-action-handler-for-behaviour-changes-between-ember-2-8-0-and

components.my-button.js

import Ember from 'ember';

export default Ember.Component.extend({
});

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  actions:{
    buttonMethod(){
      console.log('buttonMethod');
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{my-component buttonMethod=(action 'buttonMethod') }}
<br>
{{outlet}}
<br>
<br>

templates.components.my-button.hbs

<button {{action buttonMethod }}> ButtonComponent </button>
{{yield}}

templates.components.my-component.hbs

{{my-button buttonMethod=buttonMethod }}
{{yield}}

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.8.0",
    "ember-data": "2.8.0",
    "ember-template-compiler": "2.8.0",
    "ember-testing": "2.8.0"
  },
  "addons": {}
}