Started implementing MongoQuoteReadModelBuilder.
Initial work to implement a presentation model representing market depth.
Added more tests around DepthData presentation model.
Added more tests around DepthData presentation model.
Added more tests around DepthData presentation model.
Added tests to ensure DepthData can be serialized/deserialized to/from JSON.
Started implementing MongoMarketDepthPresentationModelBuilder.
Mostly completed implementing MongoMarketDepthPresentationModelBuilder. Users can now browse to /exchanges/{id}/pairs/{base}/{counter}/market_depth to see the market depth for a currency pair.
Removed PriceAndVolume - updated dependent classes to use PriceVolume instead.
Added timestamp tests around MarketDepthPresentationModel.
Extracted AbstractPresentationModel base class from MarketDepthPresentationModel.
Cleaned up MarketDepthPresentationModel. Moved id field to base class.
Merge pull request #5 from zscott/develop

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