Updates#2

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chmorgan wants to merge 9 commits intojsgoecke:masterfrom

chmorgan:changes

Commits on Sep 10, 2018

Thermostat - Add support for HvacMode of 'eco'
chmorgan
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structs - In Client struct rename ID to ClientID and Secret to ClientSecret to better match Nest documentation and REST api usage
chmorgan
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Add support for Cameras, Nest acquired DropCam, has rebranded them as NestCam
chmorgan
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stream.go - Fix DevicesStream comment to include error parameter
chmorgan
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thermostat - Add GetHvacMode() to retrieve the hvac mode as an int
chmorgan
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Introduce NewWithAuthorization() to permit using a pre-defined access token
chmorgan
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Switch from url to header parameters and properly support redirections on POST, GET, and PUT
chmorgan
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Remove Client.RedirectURL, Go 1.8 properly calls the http client CheckRedirect function on PUTs
chmorgan
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devices.go - Functions for Devices struct
chmorgan
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