renamed bower dependency "jQuery" => "jquery"; added bower_components to...

the bower.json file in the downloaded package states "jquery" as the name.
it is important because it impacts scripts with further libs depending on "jquery" .
e.g. when automatically generating sources => jquery gets injected twice.

```html
<!-- build:js scripts/vendor.js -->
<!-- bower:js -->
<script src="bower_components/jquery/dist/jquery.js"></script>
<script src="bower_components/jQuery/dist/jquery.js"></script>
<!-- endbower -->
<!-- endbuild -->
```