Support for CanJS 6

This is a breaking release which updates can-dom-mutate which itself was a breaking release. This brings support for CanJS 6.0.

Fix for comment tag callbacks

can-view-target was not properly iterating callbacks in the AST -- tags would only have their callbacks run correctly if they had at least as many attributes. This version has a fix and a test around comment tag callbacks.

Revert back cloneNode work around

Put back the removed cloneNode fix for IE11.

#78
See #65

Remove cloneNode IE8 support

• Remove cloneNode function IE8 support.
• Relying on Node​.clone​Node() with backward compatibility

QUNIT2 upgrade

This updates the tests to use QUnit@2.x.x.

#76

IE 11 Compatibility

#71

Attributes namespace URI

#69

v4.1.0

Add "use strict" #67

v4.0.1

Cleanup markdown sample code #61

use can-dom-mutate

PR: #60