Merge pull request #163 from rickcarlino/master

Minor tweaks and maintenance
Add tests to guides, controllers, and respective APIs

### What's still missing.

* Various Update tests, largely because a) those are handled through the API and b) I'm not sure how to test these.
* 404 object not found tests on both api and non-api controllers.
* User Registration and application controller tests, because I don't know much about those at all.
Fixins for the hound
Removed a whitespace
Removed a whitespace
Add slug support for crops
Merge pull request #166 from digital-dreamer/slugs

Mongo slugs
Merge pull request #165 from simonv3/add-tests

Add tests to guides, controllers, and respective APIs
Stub HTTP requests with VCR