New Twiddle

components.quill-editor.js

import Ember from 'ember';

const TOOLBAR_OPTIONS = [
  ['bold', 'italic', 'underline'], 
  [
    {'list': 'ordered'},
    {'list': 'bullet'},
    {'script': 'sub'},
    {'script': 'super'},
    'link',
  ],
  ['clean']
];

export default Ember.Component.extend({
  classNames: ['quill-editor'],
  editor: null,
  
  didInsertElement() {
    Ember.run(() => {
      const quill = new Quill('.my-editor', {
        theme: 'snow',
        modules: {
          toolbar: TOOLBAR_OPTIONS
        },
      });
      
      this.set('editor', quill);
      this.get('editor').focus();
      
      console.log( this.get('editor').getText() );
    });
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Quill Editor',
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

.message-text-heading {
  margin: 14px 0;
  font-size: 15px;
  color: #333;
}

.quill-editor .ql-toolbar.ql-snow {
  border: none;
  margin-top: 8px;
  padding: 0;
}

.ql-toolbar.ql-snow + .ql-container.ql-snow {
  border: 1px solid #bbb !important;
  border-radius: 4px;
  min-height: 200px;
}

.ql-toolbar.ql-snow {
  margin-bottom: 8px;
}

.ql-toolbar.ql-snow .ql-formats {
  margin-right: 8px !important;
}

.ql-formats {
  border: 1px solid #bbb;
  border-radius: 2px;
}

.ql-picker-label,
.ql-bold,
.ql-italic,
.ql-underline,
.ql-link,
.ql-list,
.ql-script,
.ql-clean {
  box-sizing: border-box;
  border-left: 1px solid #bbb !important;
  width: 32px !important;
  height: 28px !important;
  padding: 4px 0px 4px 5px !important;
}
.ql-bold,
.ql-list:first-child,
.ql-clean {
  border-left: none !important;
}

templates.application.hbs

<link rel="stylesheet" href="https://cdn.quilljs.com/1.3.5/quill.snow.css">
<h1>{{appName}}</h1><hr><br>

<main>
  <h5 class="message-text-heading">Message text</h5>
  {{quill-editor}}
</main>

templates.components.quill-editor.hbs

<article class="my-editor">  
  <p><strong>Quill</strong> Rich Text Editor</p>
  <p><br></p>
  <p>Quill is a free, open source WYSIWYG editor built for the modern web. With its modular architecture and expressive API, it is completely customizable to fit any need.</p>
  <p><br></p>
  <p><strong>Open Source</strong></p>
  <ul>
    <li>Quill is permissively licensed <sub><strong>under</strong></sub> <sup><strong>BSD</strong></sup>.</li>
    <li>Use it <strong>freely</strong> in personal or <u>commercial projects</u>.</li>
  </ul>
  <p><br></p>
</article>

twiddle.json

{
  "version": "0.13.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "quill": "https://cdn.quilljs.com/1.3.5/quill.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}