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
In newer Embers jQuery is removed. There is a `find` but it only returns
one element and not a jQuery selector. This patch migrates our code to a
new helper `queryAll` which allows us to remove the global.
This is where they should be as far as ember is concerned. Note this is
a huge commit and we should be really careful everything continues to
work properly.
