* bme280 environment cookbook entery
new cookbook entery fixing this issue: https://github.com/OttoWinter/esphomedocs/issues/89
* Formatting
* Fixed formatting, removed global variables
Fixed formatting, removed global variables as requested by OttoWinter
* Comply with google C++ style guide
* Fixed brackets
* Tested and fixed typos/formatting
Yalm expamples were tested by Mihalski