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"
```
now that things are much simpler how about we just use querySelector instead and create a single query containing all possible attributes. That way we'll find the first appElement in one query. We can then iterate over the list of names to get the module name.