Couchbase handle JArray support

[MichaCo]

issue added to track #51

I had an issue where I couldn't store arrays/collections straight into couchbase using the BucketCacheHandle resulting in an InvalidCastException when BaseCache uses GetCasted to return the expected type.
I've currently had to work around this by wrapping up all my cached items in another object so that the deserialisation happens as part of a child property deserialisation automatically when ToObject is called on a JObject value type.