Pyecobee

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* Uplift the implementation to include all update to the ecobee API since mid 2017

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* Internal __slots__ improvements

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* Internal refactoring of EcobeeObject and EcobeeResponse

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* Miscellaneous minor internal changes to facilitate the automatic generation of PlantUML Class Diagrams

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* Added ecobee API operations that are only accessible by EMS and Utility accounts

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* First public release supporting all ecobee API operations except those that are only accessible by EMS and Utility accounts