8957e4d9d0
Previous markup used to be
```
<div>
<div>
<li>
```
Instead we will now have:
```
<ul>
<li>
<div>
```
Note this commit also adds two things:
- ability to override tagName of a widget when attaching it
- ability to pass opts and otherOpts to {{attach}}, it could be useful in templates but is mostly useful to test `tagName` for now