Replace the `request` property with `resourcePath`

Since this should be the last step in our `postLoaders` we should provide `resourcePath` instead to let `coverage` and other karma reporters get access to the proper path, so we can e.g. generate proper lcov data, and not data containing incorrect path data. 

For example, using request we receive lcov data like this:
https://gist.github.com/srn/3c23d0fbb508f478a7b2

Using `resourcePath` we get the real deal instead:
https://gist.github.com/srn/03f440987394f2b4486a