* Add suport for presenting status with 3 LEDs
* Add support for presenting status with 3 LEDs
* Update Test_config.h
* Update User_config.h
Better names for LED variables
* Change names for LED variables
* Add support for TSL2561 based light intensity measurement
* replace Serial prints with trc, add TSL2561 code to test config
* add Adafruit TSL2561 lib to Travis config
* avoid multiple definitions and fix missing string constructor in trace