bmp280 BMP280 Barometer sensor example

This example is made for testing the BMP280 barometer sensor. It works by reading a single measurement from the device (assuming it is registered at /dev/uorb/sensor_baro0) and prints the results to the screen. The program is run without any command line arguments.

Here is an example of the console output:

nsh> bmp280
Absolute pressure [hPa] = 983.099976
Temperature [C] = 24.129999