readOnly / disabled mode does not disable pasting with CTRL + V

[viljark]

When using readOnly: true or editor.enable(false) it is possible to change editor content by pasting into it withctrl + v;

Steps for Reproduction

1. Visit http://codepen.io/viljark/pen/bwrBQm
2. click on the disabled editor
3. press ctrl + v

Expected behavior:
You can't change the editor content.
Actual behavior:
Clipboard content appears in editor
Platforms:
Win 10 Chrome 53.0.2785.143 m
Win 10 Edge 38.14393.0.0
Win 10 Firefox 49.0.1

Version: 1.0.6