Arrays have some glitchs in C# and Ruby

This PR currently fixes and breaks things.
* Changes the JSON constants to be camelCase to expose issues
* Adds missing .rb tests

Currently Ruby supports iterating an array but not indexing it. I haven't looked into why yet. The test for iterating the JSON object also fails ~~but I'm not convinced it's needed (see #52)~~.

C# can index an array OK. However, it can't iterate an array and then get the fancy property treatment on the item. I think this is because `GetEnumerator()` just returns the underlying `JObject`'s `GetEnumerator()` which isn't a `Config` class with fancy properties.

Python is all good.

Tasks
- [ ] Fix 2 failing .rb tests
- [ ] Fix 1 .cs tests
- [ ] Make the iterating array tests more robust

This will close #41 after the tests are passing.