Nested exposures are causing duplication.

[nickls]

When using a nested exposure the inner exposure appears twice in the output.

Once as a sub element and again as a top level element, see the output below.

expose :profile do
    expose :username
end

Result:

{"name":"Nick","profile":{"username":"nickls"},"username":"nickls"}

Expected Result:

{"name":"Nick","profile":{"username":"nickls"}}

[nickls]

Proof of concept:
https://gist.github.com/nickls/9560350

[nickls]

oops, should have checked lastest build:

Dupe: #57