bug in leslie branch: can't handle atomic types

[joshbronson]

I meant to fix this, but I got side-tracked. I'm adding this now, since @kornypoet is refactoring some bits of Vayacondios.

As far as I can tell from the doccos, this should work:

>> client = Vayacondios::HttpClient.new(organization: 'icstest')                                                                                                                                                                                                              
=> #<Vayacondios::HttpClient:0x007fb21aafafb8 @options={:organization=>"icstest"}, @organization="icstest", @host="localhost", @port=9000, @headers={"Content-Type"=>"application/json"}, @timeout=30>
>> client.set(topic: 'x', id: 'y', value: {z: 1})
=> {"z"=>1}
>> client.get(topic: 'x', id: 'y.z')
TypeError: can't define singleton
        from /Users/joshbronson/Source/vayacondios/lib/vayacondios/client/http_client.rb:270:in `extend_object'
        from /Users/joshbronson/Source/vayacondios/lib/vayacondios/client/http_client.rb:270:in `extend'
        from /Users/joshbronson/Source/vayacondios/lib/vayacondios/client/http_client.rb:270:in `handle_response'
        from /Users/joshbronson/Source/vayacondios/lib/vayacondios/client/http_client.rb:258:in `block in send_request'
        from /Users/joshbronson/.rbenv/versions/1.9.3-p125/lib/ruby/1.9.1/timeout.rb:68:in `timeout'
        from /Users/joshbronson/Source/vayacondios/lib/vayacondios/client/http_client.rb:257:in `send_request'
        from /Users/joshbronson/Source/vayacondios/lib/vayacondios/client/http_client.rb:124:in `request'
        from /Users/joshbronson/Source/vayacondios/lib/vayacondios/client/http_client.rb:160:in `perform_get'
        from /Users/joshbronson/Source/vayacondios/lib/vayacondios/client/client.rb:319:in `get'
        from (irb):4
        from /Users/joshbronson/.rbenv/versions/1.9.3-p125/bin/irb:12:in `<main>'

and this does work:

>> client.set!(topic: 'x', id: 'y', value: {x: '1'})
=> {"x"=>"1"}
>> client.get(topic: 'x', id: 'y.x')
=> "1"

The problem I think, is that we're trying to add singleton methods to an arbitrary Ruby object here:

https://github.com/infochimps-labs/vayacondios/blob/leslie/lib/vayacondios/client/http_client.rb#L270

but some objects, apparently immutable objects, do not allow their singleton metaclasses to be modified:

>> x = 'hi'; def x.foo() end
=> nil
>> x = {}; def x.foo() end
=> nil
>> x = :sym; def x.foo() end
TypeError: can't define singleton method "foo" for Symbol
        from (irb):16
        from /Users/joshbronson/.rbenv/versions/1.9.3-p125/bin/irb:12:in `<main>'
>> x = 1; def x.foo() end
TypeError: can't define singleton method "foo" for Fixnum
        from (irb):17
        from /Users/joshbronson/.rbenv/versions/1.9.3-p125/bin/irb:12:in `<main>'

We need a different strategy for combining the http response with the parsed object. (There should probably be a container that has both.)