Vernier Ec & Ph Upgrades

This release is the same as v0.1.0a except instead of using the dfrobot ec and ph sensors, it now uses the vernier ec and ph sensors.

Initial software release for launch of open ag initiative.

Release features basic infrastructure to handle sensors, actuators, and communication with gro-controller. Sensors include light intensity/par; air temperature, humidity, co2; water ec, ph, and temperature. Actuators include: grow LED panel, illumination white LED strip for chamber and motherboard, heater, and humidifier. Communication is over serial (UART) and can be "broken out" with the arduino serial monitor. If monitor setting are set to newline / 9600 baud the monitor will be a console for the system. Displaying sensor / actuator values always as able to receive actuator state commands and sensor calibration commands. Basic example of turning on actuator: "AAHE 1 1" turns on the 1st Actuator that is an Air Heater. "AAHE 1 0" turns it off. Currently all actuation is binary. Each sensor / actuator module follows the SensorActuatorModule interface which consists of a begin(), get() and set() method. Also, significant figures in sensor reporting tend to reflect their accuracy.