New camel-casing features

Non-breaking changes

• Added a camelCase flag to the CuriousClient constructor, which makes the objects constructed from the Curious query have camel-cased properties and relationships, rather than snake-cased ones: i.e. foo_bar becomes fooBar. This is a convenience for style and legibility, since most javascript applications use camel-cased property names as well: now, instead of having to think which kind of object you have when referencing a property, you can just treat all objects alike.