Added initial interfaces and some sensors implementing them

src/mlx90614/mlx90614.cxx

@@ -70,6 +70,11 @@ MLX90614::readAmbientTempC(void) {
     return readTemperature(MLX90614_TA);
 }
 
+float
+MLX90614::getTemperature() {
+  return readAmbientTempC();
+}
+
 /*
  * **************
  *  private area

src/mlx90614/mlx90614.hpp

@@ -25,6 +25,7 @@
 
 #include <string>
 #include <mraa/i2c.hpp>
+#include <interfaces/iTemperature.hpp>
 
 #define DEVICE_ADDR         0x5A // device address
 
@@ -73,7 +74,7 @@ namespace upm {
  * @image html mlx90614.jpg
  * @snippet mlx90614.cxx Interesting
  */
-class MLX90614 {
+class MLX90614 : virtual public iTemperature {
     public:
 
         /**
@@ -109,6 +110,13 @@ class MLX90614 {
          */
         float readAmbientTempC(void);
 
+        /**
+         * Returns the temperature in degrees Celsius
+         *
+         * @return The Temperature in degrees Celsius
+         */
+        virtual float getTemperature();
+
         /**
          * Returns the name of the component
          */