Initial upload of test test code for MS5803-14BA

This code displays pressure and temperature values from the MS5803-14BA
detected through its I2C bus on the "serial monitor" screen in the
Arduino IDE.  Because the MS5803-14BA uses a 3v3 logic, the user should
take care to only power the devise with 3v3 (not 5v).  CLK and SDA seem
to work when attached directly to the Arduino, however.
Merge branch 'master' of git://github.com/OpenROV/openrov-software into bbb25