chore(bootstrap): Remove support for old bootstrap mechnanisms

Remove support for bootstrap detection using the element id or the element class. E.g.

```
<div id="ng-app">...</div>
<div class="ng-app: module">...</div>
```

Removes reference to bootstrap using IE7

BREAKING CHANGE:

If using any of the mechanisms specified above, then migrate by
specifying the attribute `ng-app` to the root element. E.g.

```
<div ng-app="module"
```
how about we get rid of this and the other nested forEach and move the module name lookup logic into the forEach above?

That would mean that instead of building up the query, we'll actually use `querySelector` to find the first matching element (we don't need `querySelectorAll` since we bootstrap only the first one). This way everything is much simple and more efficient for the `ng-app` use case and we still support the other attribute names.

We should also reorder the the names array to list `ng-app` followed by `data-ng-app` as the first two names.