Refactor to handle new backend profiles.

Let `ngHalMock.stubEnclosure()` receive optional mixin uris before the enclosure url.

Automatically digest as often as possible for ngHalMock promises.

Fix issue where transformations happen more than once on ngHalMocked objects.

Refactor stories module for better readability.

Return value of `ngHalMock.stubFollow[One]` is now a jasmine spy, meaning that you can verify that it has been called and what parameters were passed.

100% coverage in the src/stories, src/series folders.