bmp280/bme280: C port, C++ wraps C

Some private methods (relating to calibration/compensation) are no
longer exposed.  In addition, the driver auto-detects the chip (BMP280
or BME280) and acts accordingly, rather than requiring the
specification of a chip id in the ctor.

The getHumidity() method no longer accepts an arguement representing
pressure at sea level.  A new method is provided to specify this.

Signed-off-by: Jon Trulson <jtrulson@ics.com>

src/bmp280/jsupm_bmp280.i

@@ -6,6 +6,8 @@
 %include "iHumiditySensor.hpp"
 %include "iPressureSensor.hpp"
 %include "iTemperatureSensor.hpp"
+
+%include "bmp280_regs.h"
 %include "bmp280.hpp"
 %{
     #include "bmp280.hpp"