Add bme280 sensor#38

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wolfeidau wants to merge 5 commits into

goiot:masterfrom

wolfeidau:add_bme280_sensor

Commits on Jun 26, 2016

Initial work on support for the bme280 i2c sensor from Bosch.
wolfeidau
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Commits on Jun 29, 2016

Sorted out tempreture and pressure now working on humidity
wolfeidau
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Commits on Jul 9, 2016

All readings now approx. match output from adafruit python library.
wolfeidau
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Commits on Jul 10, 2016